Taiki 12″ 1.5mm X 60 Degree 3 Piece Aluminum Soft Jaw Set ~ Supplies maximum concentricity on finish turning operations. ~ Can be bored or turned to fit work piece. ~ Jaws can be hardened. ~ These are made to be used on Kitagawa, Samchully, Strong, MMK, SMW Autoblok, Howa & Hitachi-Seiki Chucks. ~ Groove Width D: .710 (18mm) ~ Screw Size E: .55 (M14) ~ Hole Space F: 1.181 (30mm) ~ Hole to Front H: 2.362 ~ C: 1.89 ~ A: 5.08 ~ B: 1.89 ~ Taiki # TW-305A4