The Vevor diamond core drill bit set is designed for precise drilling in hard materials such as tile, ceramic, porcelain, granite, and marble. This 10-piece kit includes multiple bit sizes for a wide range of drilling tasks and features a triangular shank for use with electric drills. Built with diamond and 45# steel, the bits are made for smooth cutting in both dry and wet applications. An aluminum alloy storage case is included for convenient transport and organization.