1.the tap collet Material:65Mn 2.Hardness:HRC44-48 3.Size:ER16-ER40 4.dxa:3.5x2.7,4.0x3.0,4.5x3.4,5.5x4.3,6.0x4.9,7.0x5. We are a leading supplier of varios machiner accessories in China.We can supply collet,chuck,vise,tool holder,sleeve,arbors etc.1.the tap collet Material:65Mn2.Hardness:HRC44-483.size:3.5x2.7,4.0x3.0, 4.5x3.4,5.5x4.3, 6.0x4.9,7.0x5.5,8.0x6.2,9.0x7.0, 10x8.0,11x9.0,12x9.0,14x11, ...