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)

Fast shipping exactly what I needed

Gave to someone

I used this to drill one hole through steel siding, osb and some spray foam insulation in order to vent a bathroom basement exhaust fan. It worked perfect for my single hole. I ran it backwards at the beginning of the cut so it didn’t catch and I had a nice clean hole in the end.

Although they seemed a little pricey...the investment was well worth it. I purchased the 6 1/2 and 4 1/4 sizes for my 6 and 4 Torchstar Slim LED lights (purchased on Amazon) and they were amazing. I added 40 lights and these paid for themself after 5 in my opinion. Make sure you have a 1/2 drill, i didnt read that part so I borrowed a friends, I had a 3/8.

I needed the 6 3/8 hole saw to install a duct for a range hood through four kitchen cabinets. The Koopi is a heavy duty unit, accent on heavy, and the one I received seems round and well balanced. Learn-by-doing experience: I found that my 20 volt Dewalt drill is adequate for this saw, but I wouldnt want to use anything smaller. The saw is unwieldy to use, especially in the top of a wall cabinet where keeping the saw parallel to the cutting surface is a challenge. Using the drills clutch to keep the drill from spinning dangerously when the teeth bind in the wood was the only way I could manage it. This way when the saws position isnt just right the drill clutch engages; when the hole saw is correctly placed the teeth do their job fairly well. It did take some time to cut each 1/2 inch deep hole--and my high end Dewalt drill got very hot--but the saw worked well. Ive cut seven plywood holes so far and the saws teeth dont seem too worn yet. This is a pretty good tool for something I only need for one job.

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.

At a large hardware store this will cost you over $30. Here it was a fraction of the cost without compromising the quality. I was installing a laundry exhaust and had to cut through aluminum siding asphalt siding and plywood for a total of 3 inch thickness wall. I did have to do it in increments because of the depth of the hole saw but that is to be expected.

everything

Its not crazy high quality, but if youre a DIYer putting in some wafer lights, it will do the job without falling apart. Pro tip: run it in reverse to keep your drywall cuts clean and dont push too hard.

Cut through fibreglass easily