Yakamoz 4PCS HSS Door Self-centering Hinge Hole Opening Drill Bit Set, 5/64", 7/64", 9/64", 11/64" High speed steel with a brass body designed, durable and excellent for use Easy to use and install, change bits fast which one-handed load and release Drill bush for precise positioning, will not shift Sawdust will be automatically discharged from the top of the drill holes on both sides, not stuck drill 4 popular sizes used for carpenters, cabinet, furniture makers and other wood working trades