Self-Feed Wood Drill Bits. Self-feed drill bits offer a one-piece, forged high-carbon steel design for maximum strength and durability. A single inner-cutting blade shaves clean, smooth holes in all types of wood, even green rubber wood. The precision-milled 7/16" shank tightens securely into the drill bit to eliminate wobble for accurate drilling. Features: 2 x 0.43" Self-Feed Wood Drill Bit. Specifications: Dimension 2.5 x 4 x 7.25" Hub 72.5 Weight: 0.8 lbs