Taiki 15″ 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: .866 (22mm) ~ Screw Size E: .787 (M20) ~ Hole Space F: 1.69 (43mm) ~ Hole to Front H: 3.346 ~ C: 2.44 ~ A: 6.5 ~ B: 2.44 ~ Taiki # TW-305A4 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: .866 (22mm) ~ Screw Size E: .787 (M20) ~ Hole Space F: 1.69 (43mm) ~ Hole to Front H: 3.346 C: 2.44 ~ A: 6.5 ~ B: 2.44