Hardinge 5C Round Smooth Collet with No Internal Stop Thread, 0.016" Hole Size Collet for holding workpieces in a lathe or other machine tool Size 5C round smooth collet with a through-capacity of up to and including 1-1/16 inches Back bearing diameter of 1-1/4 inches and overall length of 3-17/64 inches Heat-treated right-hand 1.238 inches x 20 external threads for long life, no internal stop thread Hardened and ground spring steel for accuracy and resistance to wear and breakage