Features: Higher efficiency with the 3 teeth cutter head.It is more accurate and safer to use these drill bit sets in a drill press.The head is good at removing the debris and working efficiently with radian curved design.The tip is specially designed to cut through hole cleanly, great for boring concealed hinges and door locks.This Forstner Drill Bit is high hardness, wear resistance, good toughness, heat and corrosion.Applicable to various gypsum, plastic, wooden board, solid wood, artificial wood, indispensable woodworking gadget.Easy to install and use, bench drill, high power electric grinding, pneumatic drilling, magnetic drill. Warning Tips:The temperature of these materials: wood, plastic, plywood etc.