Hardinge 5V Round Smooth Collet, 1/2" Hole Size Collet for holding workpieces in a lathe or other machine tool Size 5V round smooth collet with a through-capacity of 9/16 inch Back bearing diameter of 27/32 inch and overall length of 3-7/8 inches Heat-treated right-hand 0.775 inch x 18 external threads for long life Hardened and ground spring steel for accuracy and resistance to wear and breakage