AccusizeTools - 5C 5" Collet Chuck with Integral D1-3 CAMLOCK Mounting, Stud = 9/16", 0269-0013 Outside Diameter: 5". Max. RPM 6000. Accuracy: .0006 TIR. Weight: 10.44 lbs. Spindle: D1-3. No. of Stud: 3. Itegrated D1-3 back mounting. Install on the machine in seconds, no machining required. Can be used on any lathe with D1-3 cam lock mounting Can use any size 5C Collet: Round collet :1/16 ~ 1-1/8"; Hex collet:1/8" ~ 7/8"; Square Collet:1/8" ~ 3/4" Scroll and pinion design just like 3-jaw chuck, operated with chuck key. Scroll & pinion precision machined and hardened.