Greenlee 645-011 Small Arbor for 5/8" - 2-1/4" Kwik Change Carbide-Tipped Hole Cutter
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In the event that you need to replace it, it's a specialty bit only made by Greenlee.
I'm not sure what size it is, but it is Metric rather than SAE.
Selected User Reviews For Greenlee 645-011 Small Arbor for 5/8" - 2-1/4" Kwik Change Carbide-Tipped Hole Cutter
This thing is fantastic because I use a variety of hole saw sizes on a regular basis. The fact that you only have to buy new hole saws rather than an entire new arbor when it wears out is extremely convenient. I spend my days cleaning stainless steel kitchen hoods.
To use this hole saw, you'll need to purchase a bit from Greenlee. It'll set you back at least eleven dollars. Aside from that, it's an excellent hole saw. Make sure you get the long greenlee bit, not the short one, because the short one won't fit.
This cutter was used to drill holes in the frame of an automobile. I drilled them into the double-thickness (boxed) underside of the frame. It's nearly a half-inch thick. It worked great, but I had to go through three pilot bits. Drill a pilot hole with a 1/4 bit and only use the pilot to center the cutter. The pilot is a very hard bit that cuts well, so cutting with it is tempting. It, on the other hand, is incapable of any bending.
Because you don't have to remove the arbor to get the saw off, the changeout is completely painless for the saw. Simply remove the saw and replace it with a new one by turning it counterclockwise. There are no allen keys to lose or loosen, and no screwdrivers are required. To change it, all you need is a glove and a fairly warm saw.
This thing would be fantastic if the spring didn't pop out every now and then.
My personal favorite k o set.
Everything went according to plan.