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.

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.

These bits boar through concrete with no problem.

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

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.

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.

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

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.

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.