Taiki 10" 3 Piece 1/16" x 90 degree steel soft jaw set supplies maximum concentricity on finish and turning operations. Can be bored or turned to fit workpiece. Jaws can be hardened. Made of SAE1045 steel. Suitable for use on SMW auto Blok, Rohm, Pratt burner and other chucks. Groove width (D) is 0. 669. Screw size (E) is 12mm. Hole space (F) is 0. 875". Hole to front (H) is 2. 283". Width (C) is 1. 57". Length (A) is 4. 33". Height (B) is 1. 65". Taiki # SJ250/17B