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5C Collet Chuck w. 1-1/2"-8 semi-finished adapter mounting back plate. Brand New Chuck OD Diameter: 5" Adapter with 1-1/2"-8 thread to match your spindle. You can machine the recess diameter and 3 holes on your machine to connect the chuck. To machine the recess diameter on your machine will guarantee better TIR accuracy. Any Size 5C Collet From 1/16 through 1-1/8" can be used. Scroll operation Design just like 3-Jaw Chuck , Operated With Chuck Kay. Scroll & Pinion Precision Machined and Hardened Max. RPM 6000, steel chuck structure. Accuracy: 0.0006 TIR