We ordered this to cut a hole to extend the shower into a reinforced tile. Being cheap we opted for the lowest price, however were pleasantly surprised and equally/more disappointed. It is absolutely impossible, apart from a wooden template, to center the drill on the tile. In contrast to comparable woodworking drills, there is no center drill. This makes it almost impossible to hold the bit in place, creating a mess. For dyers (we've done some large and complex projects over the years) like us. If you are a seasoned pro used to this type of beat then this is a real find. If you are a dyer, you need to create a pattern that requires more time, materials and tools. If they add a drill to create a pilot hole it would be 6 stars out of 5.