Unbeatable at this price. Well made and sharp, they drill effortlessly. They work as advertised and are better than other products I have used. When I got them I drilled a total of 8 holes for doorstops, through the tile, over the concrete slab. They didn't need "dimples" to start the hole: with light pressure, the tip didn't lose and continued to cut into the tile with ease. They cut the tiles very quickly and made extremely smooth holes with minimal chipping. The first two pictures show a fantastic result with this product and how smooth the holes are: they are much more precise than any other drill I have used. Third photo, same result except for the center hole which was my mistake, not the bits: I damaged/broke off the edges trying to enlarge the hole a bit.