Input Drive Size: 3/8" Drive Shape: Square Length: 75mm Type: Inhex Bit Socket Output Size: 1/4" Output Shape: Hex Product Dimension (Refer Line Drawing Image): D Size: 18mm H1 Size: 15.5mm H2 Size: 57mm L Size: 75mm 3/8 Sq. Dr. Bit Socket 1/4 Hex Length 75mm