AccusizeTools - 5C, 5" Collet Chuck with Integral D1-5 Camlock Mounting, 0269-0015 5C 5" Collet Chuck with Integral D1-5 Camlock Mounting, Stud = 5/8", #0269-0015 Outside diameter: 5-1/2" Spindle: D1-5 cam lock No. of stud: 6 Diameter of stud: 3/4"