GSTK 10pcs Concrete Hole Saw Set （30mm 40mm 50mm 65mm）with SDS Plus Shank Connecting Rod and 5pcs Dust Catchers, Concrete Hole Saw Kit for Concrete|Cement|Brick Stone|Wall.

Good product. Got the job done and looks like the hole saw was barely used after going through 8 inch concrete block. Would buy again.

Used this for drilling a 50 year old concrete , cut like butter , not much wear either. good product , good price.

This drill bit was only good for drilling the one hole in concrete. It was dull after that and i had to buy another(different brand) to finish the job.

Allen screw doesn’t stay and hold the pilot bit.

These bits boar through concrete with no problem.

Why they made such a large bit for the bosch bulldog is beyond me. Not enough power for granite - it would take all day. Maybe it would work better on some softer material.

I never in a million years thought this would work for the price. I was totally shocked. It works every bit as good as the ones that are $100 plus. Drilled through brick with no issue at all.

Worked great until the shaft broke on the 3rd hole I was drilling. Great value and would have recommended had it not broke.

Ordered the 110mm to put a hole through some 1” thick stucco on the side of the house to properly vent out a bathroom. It got the job done. Cut through the mortar, aggregate and steel mesh with no problem. Would buy again. Two things to be mindful of: when you let go of the switch, the head might just spin off so be careful. I had to catch it mid air and it tore up my bare hand. And two, be sure to tighten the center bit with a wrench real good. It came loose and fell out.