Taiki 8″ 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: .551 (14mm) ~ Screw Size E: 1/2 (M12) ~ Hole Space F: .984 (25mm) ~ Hole to Front H: 1.811 ~ C: 1.38 ~ A: 3.74 ~ B: 1.46 ~ 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: .551 (14mm) ~ Screw Size E: 1/2 (M12) ~ Hole Space F: .984 (25mm) ~ Hole to Front H: 1.811 C: 1.38 ~ A:3.74 ~ B: 1.46