Royal Products 5C STEP COLLET, 4 INCH DIA.

The Royal Products 5C STEP COLLET, 4 INCH DIA. (Part Number 20024) has a head diameter of 4", a pilot hole size of 5⁄16" and a pin diameter of 1⁄4".
*** We recommend ordering a collet with a head diameter at least 1/2" larger than workpiece diameter. ***
Note — these step collets close on the 10° angle, not the head OD. When using, be sure part is sufficiently clamped.