The 7-Point Cutting Tool Checklist I Built After $4,200 in Mistakes

Who this checklist is for

I'm the operations manager at a small custom millwork shop — 12 people, mostly kitchen and bath cabinetry, plus a decent amount of repair work. I've been placing cutting tool orders for 8 years. In that time I've personally made, and documented, 11 significant purchasing mistakes totaling roughly $4,200 in wasted budget. This is the checklist I now keep on the wall by the order desk.

It's for anyone who buys saw blades, router bits, drill bits, or grinder blades — whether you're a shop owner, a contractor, or the person who gets stuck doing procurement because you're the only one who knows what an arbor is. Seven steps. None of them are glamorous. All of them are cheaper than a redo.

Step 1: Confirm the arbor size before anything else

This is the one that got me first. In my first year (2017), I ordered a Freud tool — a 10" blade — for our table saw. Beautiful blade. Cut like a dream, on the saw it fit. Our second table saw, an older Delta, had a different arbor. The blade sat in its packaging for 3 months until I finally sold it to a guy on Craigslist for half what I paid. $65 down the drain.

Check both your saw's arbor diameter and the blade's. Most 10" table saws use a 5/8" arbor. Most 12" saws do too, but not all of them. Some European saws use 30mm. If you're buying for multiple machines, buy for the most common arbor and keep a bushing kit for the odd one out.

Check point: write the arbor size on a sticker and put it on each saw. I know that sounds like a kindergarten craft project. Do it anyway.

Step 2: Know what Freud vs Diablo actually means

Here's something that took me embarrassingly long to understand: Diablo and Freud are not competitors. Diablo is a Freud brand — same parent company, different product positioning. I don't have hard data on the exact manufacturing differences, but based on what our tool reps have told me and how both lines perform in our shop, my sense is this:

• Diablo is aimed at contractors and serious DIYers — fast cuts, framing, demolition, jobsite use. Good value, widely stocked at home centers.
• Freud industrial line is aimed at shops that run blades all day. Thicker plate, more carbide, better heat resistance. Costs more, lasts longer under continuous load.

So when people search "Freud vs Diablo saw blades" expecting a fight, the honest answer is: it depends on how many hours a day the blade runs. If you're cutting 40 cabinet sides a week, the industrial blade pays for itself. If you're doing trim work and the occasional deck, Diablo is probably the smarter buy. Buying the industrial blade for occasional use is like buying a commercial espresso machine for your kitchen — technically better, practically overkill.

Step 3: Match hammer drill bits to the drill's chuck system

SDS Plus. SDS Max. Keyed chuck. Spline. These are not interchangeable, and the wrong one will not go in — which is at least a fast failure. The slow failure is buying a bit that fits but is sized for the wrong class of drill.

The rule I follow: SDS Plus for most rotary hammers up to about 1" capacity, SDS Max for the big demo hammers, and regular masonry bits with a hex or round shank only for light duty in a standard drill. Check the shank diameter, not just the "SDS" label. SDS Plus shanks are about 10mm; SDS Max are about 18mm. If you're standing in a store holding a bit and a drill, this is a 5-second check.

Step 4: Router bit shank diameter and collet — the mistake that cost me a day

September 2022. I ordered a set of Freud router bits for a cabinet door job. Half-inch shanks. Our main router table had a quarter-inch collet. I didn't check. The bits arrived Friday, the job was due Monday, and I spent Saturday morning driving to three stores looking for a half-inch collet that fit our specific router model. Found one at the third stop. Lost half a day and $40 on the collet.

Two things to check: the shank diameter (1/4" or 1/2") and whether your router accepts that collet size. Half-inch shanks are stiffer and better for large bits and deep cuts. Quarter-inch is fine for small profiles and trim. If you're buying a set, buy for the router you'll actually use most, and keep a spare collet of the other size if you can.

Step 5: Don't assume angle grinder blades are universal

Are angle grinder blades universal? No — and this trips people up because the grinder itself looks universal. Three things have to match:

1. Diameter. A 4.5" grinder takes 4.5" wheels. A 5" takes 5". You can sometimes run a smaller wheel on a bigger grinder, but never the reverse.
2. Arbor hole. Most are 7/8" (22.23mm), but not all. Some are 20mm. Some are 5/8"-11 threaded for specific applications.
3. Max RPM. This is the one people ignore. The wheel's rated max RPM must be at or above the grinder's no-load RPM. A wheel rated for 8,500 RPM on a grinder that spins at 11,000 is a grenade with a guard.

I've never fully understood why grinder manufacturers don't standardize the arbor, and honestly I suspect it's partly historical accident. But the result is that "universal" is a marketing word, not a spec.

Step 6: Decide local vs online before you're in a hurry

This is the "chainsaw near me" problem. When you need a cutting tool today — a replacement chain, a blade for a job that starts tomorrow — you search locally and you pay whatever the local shop charges. When you're planning ahead, online usually wins on price and selection.

The mistake I made for years was defaulting to online even for urgent stuff, then paying for expedited shipping that still arrived a day late. Now I keep a running list of what our local dealer stocks (blades, common router bits, SDS bits) versus what we order online (specialty profiles, bulk drill bits, replacement parts). The list changes maybe twice a year. It's saved me at least four panic drives.

Step 7: The 5-minute pre-order call

Before any order over $200, I make one phone call or send one email. Three questions:

• "What's the exact arbor or shank spec on this item?" — verify against the machine, not the listing.
• "What's the return policy if it doesn't fit?" — especially for bits and blades, which often can't be returned once opened.
• "What's the actual lead time, not the estimated one?" — ask for the shipping date, not the delivery window.

We built this checklist after a Q1 2024 order came in with three wrong items in a row. Since then, we've caught 47 potential errors using it in the past 18 months. Most were arbor or shank mismatches. A few were RPM ratings. One was a router bit set listed as "1/2 inch" when the collet was metric.

What I still get wrong

I don't have hard data on failure rates across brands, and I'm not going to pretend I do. What I can say from 8 years of orders is that fit mistakes — arbor, shank, chuck type — cause more wasted money than quality differences between reputable brands. The Freud vs Diablo question matters less than whether the blade fits your saw and suits your workload.

The best part of finally getting this checklist systematized: no more 3am worry sessions about whether the bits will arrive in time for the Monday install. There's something satisfying about opening a box and knowing it'll fit before you even take the tool out of the packaging. That's the whole point of a checklist.