Self-Feed Bits 1-5/8" - This Self-Feed Bits for Drill provides clear cutting without effort.Self-Feed Bits 1-5/8" features include: Self-Feed Bits for Drill Cuts Faster &: Has Improved Balance with Reduced Runout Shanks Have Flat Surfaces for Secure Chuck Grip Feed Screws Removable &: Replaceable Feed Screw Provides Fast, Effortless Feeding Even in Gummy Wood Double Sided Feed Screw &: Allen Wrench furnished With Each Bit - After Bit is Worn, You Can Reverse the Bit to the Other Side Inside Cutting Plane Shaves Hole Radius for Clean, Smooth Holes without Pressure Spurs on Outside Diameter Cut Holes Clearly &: Accurately Universal 7/16in, shank Dimension Measurements = Inches Order Qty of 1 = 1 PieceBelow is more info on our Self-Feed Bits 1-5/8"