Full Bullnose Segmented Diamond Router Bits are designed to produce perfect V shape – full bullnose edges on natural or engineered stone, porcelain tiles and concrete countertops. These diamond bits are used for profiling or creating different edges on marble, granite, engineered stone, porcelain, concrete, and more. The difference between Concrete Hand Profile Router Bits and traditional ones is hand profile bits can be used on a handheld machine such as an Angle Grinder instead of having to use a Stone Router.