IRWIN 18-in Self Feed Bit Extension - Each

All bits have a 7/16-in hex quick change impact shank that fits 1/2-in or larger electric drills or 7/16-in hex impact wrench drillsFor drilling large diameter holes in wood for pipe, conduit and other applicationsReplaceable coarse screw point drills quickly in dry, wet, and gummy woodPrecision milled shank eliminates runout and wobble
Specifications -