Wright Tool 9280 1/4" Hex x 1/4" Square Drive Adaptor 1/4-Inch drive bit holder Overall length of 1-Inch Constructed of alloy steel for strength and durability Black industrial finish Head size of 1/4-Inch 1/4 inch drive bit holder Overall length of 1 inch Constructed of alloy steel for strength and durability Black industrial finish Head size of 1/4 inch