Pro Series by HHIP 3900-0682 Collet Chuck Nut, M-Type Er20, 18000 RPM
M-Type Er-20 Collect Chuck Nut - Balanced To 18,000 Rpm - Tolerance Is .0003" Maximum - Material Is 42 Crmo - Hardness Is Hrc 50-52 - Thread Tolerance Class Is 4H-Class - Thread Is M24 X 1.0 - D Is 28 Mm. - L Is 19 Mm.