ITEM NAME:1/2inch Drill Chuck Adaptor For Impact Wrench Conversion 1/2-20Unf With 1 P K4K1 1/2inch Drill Chuck Adaptor For Impact Wrench Conversion 1/2-20Unf With 1 P K4K1 1/2inch Drill chuck adapter for impact wrench conversion 1/2-20UNF High strength and hardness Durable in use Screw size 20* 11 *11cm Drill chuck conversion post size 5.1 * 2.4 * 2.4cm Color: black + gray material: metal Package Content: 1* Screw 1* Drill chuck conversion post.Color: black + gray.