M-TYPE MINI ER-20 COLLET CHUCK NUT (3900-0682)

M-Type Mini 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 M13 X .75 D is 16 mm L is 12 mm Shipping Weight: 0.05 lbs