Features: 3-Jawed Chuck 7/16" Blue Bully Hex adapter Chuck Key Cat. No. 2590 The Aircraft Dynamics 1/2" Industrial Chuck Kit w/ 7/16" Quick-Change Adapter enables your impact to drill holes (up to 1/2" dia. max) with jobber bits in steel, wood, fiberglass and plastic, or use carbide tipped bits to drill into mortar, brick etc.) Note: Blue Bully Adapter should not be used with any tool/accessory that results in continuous impacting.