4 PC CAT40 ER40 Precision Collet Chuck with 11PC ER40 Collets 2.75 projection length. Pre High Speed Balanced Chuck 20K Meets All Industrial Standard. Coolant through and Anti Rust design. Gage or projection length of ER40 is 2.75. Accuracy in couple tenth chuck and collets together 11PC ER40 Collets by 16th.1/8, 3/16, 1/4, 5/16, 3/8, 1/2. 5/8, 3/4, 1, 1-1/16, 1-1/8.
Fully ground flange and V-groove - easy on tool changers for less spindle and changer maintenance V-Flange CAT40 is production balanced to 20K high speed spindle turning and meet standard industrial needs. Hardened and ground to ensure maximum accuracy. Through spindle coolant capability from pull stud to collets Decent quality at reasonable price All chucks are passed hardness and anti crack test. Low strength steel could lead crack and rust very soon, especially by the inside pocket area, accuracy will drop too after a little while, so make sure avoid those bad steel and unbalanced chucks. All sellers claim 20K balance and good steel, but yes or no, time will tell.
Copy paste my item description is easy, but really make chuck running true and last is difficult.