1. Fast single tool changing - no need to touch drawbar after inserting master holder

2. Spring collets are hardened and ground for maximum holding power and ultra precision

3. MT3 shanks ultilize a drawbar thread: 1/2" - 13

4. Collets must be snapped into nut before inserting and tightening into holder

5. 16 pcs MT3 set include: collet chuck, 15 full grip collets 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16",1" and spanner wrench