BT40 ER20 Milling Collet Chuck Holder Proj. 3.94" Balance 25,000rpm

Taper: BT40. Projection: 3.94" (100mm). Thread :M12 x 1.75P L1:100mm d3:34mm d1:45mm Made of alloy steel and hardened to HRC 60-62. Balanced to 25,000 RPM. Tested T.I.R: 0.0001" Weight: 4 lb. Dimensions: 8 x 2 x 2 in.