7Pcs 5C Hex Collet 1/4",5/16",3/8",1/2",5/8",3/4",7/8" Mill Collet Holder Fit fo
7Pcs 5C Hex Collet 1/4",5/16",3/8",1/2",5/8",3/4",7/8" Mill Collet Holder Fit for CNC Engraving Machine. Size 7pcs 5C hex collet set. 7 PCS 5C Hex Collet. The 5C square collet is made of high grade spring steel, hardened and accuracy ground.