INSIDE CUTTING PLANE – Produces clean smooth holes. * HEAT TREATED ALLOY – Maximum durability and wear resistance. * RESHARPENABLE – Longer bit life-Less time and money buying a new bit. REPLACEABLE FEED SCREW – Effortlessly pulls bit through material. Standard Equipment: Self-feed Bits: 1-1/2", 2 ", 2-9/16 "; (6) Feed Screws; (3) Set Screws; and Hex Key * REPLACEABLE FEED SCREW – Effortlessly pulls bit through material. * Standard Equipment: Self-feed Bits: 1-1/2", 2 ", 2-9/16 "; (6) Feed Screws; (3) Set Screws; and Hex Key