【cemented carbide】These forstner drill bit are made from hard cemented carbide, perform quite well in woodworking hole drilling. 【cylindrical cutter】The cylindrical cutter around the perimeter shears the wood fibers at the edge of the bore, and also helps guide the bit into the material more precisely. 【center point】The bit includes a center point which guides it throughout the cut and incidentally spoils the otherwise flat bottom of the hole. 【radial cutting edges】This hole boring bit has radial cutting edges to plane off the material at the bottom of the hole. 【11 sizes】There are 11 different sizes of forstner drill bit which you can choose the one you need to use., Manufacturer: Hilitand