... , ceramics and marble etc hard brittle things.Diamond glass cutting point is superior products of Tongyu Diamond tools, famous for its high sharpness ... resistance .Various shapes:Bullet knife, Dual cutter, Pairs of cutters, diamond knife, Concavepairs of toothed cutters, pairs of mushroom-shaped knife ... Concave knife, Spherical knife, Inverted cone-shaped knife, Cone knife, Diamond Glass Cutting Point