AccusizeTools - 5C 5" Collet Chuck with Integral D1-4 CAMLOCK Mounting, Stud = 5/8", 0269-0014 Outside diameter: 5". TIR: 0.0006". Spindle: D1-4 cam lock. No of Stud: 3. Diameter of Stud: 5/8". Max. RPM 6000. Itegrated D1-4 back mounting. Install on the machine in seconds, no machining required Can be sued on any lathe with D1-4 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.