Koopi 4.25 Hole Saw with Heavy Duty Arbor, 38mm Depth Bi-Metal 4 1/4 inch Hole Cutter for Easily Drilling Wood, Plastic, Plywood, Drywall, Thin Metal (108mm)

Good value, came with spindle and an extra center bit which is really nice. Seemed to clog a little faster then some of the name brand hole saws I have in my collection but did an adequate job of cutting. Didnt cut all the way through so unsure of how hard it is to remove the cut out piece only has small slots for that purpose. All in all excellent price and fast delivery.

This little saw cut 8 holes through Hardy Soffit and I beleave it remains sharp enough to cut 8 more

Gave to someone

This product came disassembled, with no instructions in the box. Ive been in construction for forty years, and Ive used lots of tools with arbors. But this arbor was a new one on me. I tried for a half-hour to figure out how to put it together. Finally had to go to computer and take a close look at the item on the Amazon page. Also, be aware assembly will probably require use of a pair of split-ring pliers. Once assembled, it did a good job cutting through 1 pine siding and 1/2 flakeboard sheathing using only a P-C cordless drill. Be aware, though, that advertised 1 1/2 cutting depth is shall we say optimistic. Id say 1 1/4 is more like it. For example, I dont think you could cut a hole through a 2x4 without coming at it from both sides.

Ordered this hole saw to install ceiling cans. It works great on the first three. After that It dulled quickly.

This worked exactly as I hoped. Cut 5 holes in 10 minutes start to finish. I was cutting holes for 6” recessed lights in 1/2” wood ship lap. Last hole cut with same ease as first. Yes it makes a little mess but HELLO, you’re cutting wood. I covered floor and countertops with shipping blankets. Clean up was minimal and easy. Arbor locks into bit for safe use. *** Need 1/2 Chuck. ***

I bought this to drill 6 holes in my ceiling to install LED lights. It is a custom home from the early 70s, so the ceiling drywall has about an 1/8-3/16 of plaster finish. By the third hole, the teeth were 75% gone and it would not cut. I had to cut the remaining three holes with a key hole saw - that saw had no problem at all cutting the plaster-coated drywall. Im sure the plaster layer is more abrasive than plain drywall, but this bit is supposed to be able to cut through metal. I cant imagine this bit would hold up for very long in anything other than plain drywall. If thats how it was advertised, Id be fine with the outcome, but they represent this as a cuts anything bit, and that is very far from reality.

Arrived safe and sound, used it to cut sheet steel. Easy cut through.

before I ordered this I read the reviews, one person said teeth broke off just trying to saw sheet rock, so I went to hardware store and it was almost $50.00 so I thought I will take a chance on this one for half the money,sure glad I did I just cut through the floor 5/8 sub floor on 1 lumber went through like butter saw looked perfect after I was done, dont be afraid of this because of price, it tough!

This did exactly what I needed it to do. I would rate it for 15 or so holes through plywood sheet metal etc. Came with extra centering drill bits and Allen wrenches. If youre not doing this professionally and repeatedly this is all you need.