Taiki 6″ 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: .472 (12mm) ~ Screw Size E: 3/8 (M10) ~ Hole Space F: .787 (20mm) ~ Hole to Front H: 1-1/2 ~ C: 1.22 ~ A: 2.87 ~ B: 1.18 ~ 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: .472 (12mm) ~ Screw Size E: 3/8 (M10) ~ Hole Space F: .787 (20mm) ~ Hole to Front H: 1-1/2 C: 1.22 ~ A: 2.87 ~ B: 1.18