When I'm drilling masonry, I change the drill bits every few holes because the drill bits get dull. This set makes sense as it comes with five masonry bits, 6mm and 8mm, giving you enough bits for real work. I used 8mm masonry bits with my impact drill to drill 65mm (2.5") deep holes in cinder blocks to install the hex socket. Anchor so I can install some shelves. I have a spray bottle with Used water to keep things wet while drilling The impact bit helps but the bits did their job without turning on the hammer function I broke off one bit when it got stuck but otherwise The rest of the bits cut quickly and do the trick several holes each.