Input Drive Size: 1/2" Drive Shape: Square Length: 77mm Type: 12 Point Deep Socket Output Size: 5/16" Opening: 12pt Product Dimension (Refer Line Drawing Image): D1 Size: 13.2mm D2 Size: 21mm H Size: 9mm H1 Size: 59mm L Size: 77mm 1/2 Sq. Dr. Socket 5/16 12 point Length 77mm