Item Type: Back Pull Collet Material: 65 Mn Accuracy: 0.005 Hardness:> HRC48-55 Carburizing Depth: >0.8mm/0.31in Surface Roughness: >0.8mm/0.31in Diameter: Approx. 7mm/0.28in Use: Widely used for milling, drilling, tapping, engraving, CNC, half cone angle of spindle machine collet, with great clamping force Package List 1 x Back Pull Collet 1With heat treatment and cold drawing hardening, the strength is relatively high, with a certain degree of flexibility. 2Adopt quenching processing, fine workmanship, sturdiness and durability, inner hole grinding. 3Manufactured with strong clamping force, high rigidity, low noise, very good choice for you. 4Widely used for milling, drilling, tapping, engraving, CNC, half cone angle of spindle machine collet. 5High performance and high quality, the carburizing depth is above 0.8mm/0.31in, practical in use.