Hardinge 5C Round Smooth Special Accuracy Collet, 0.017" Hole Size Collet for holding workpieces in a lathe or other machine tool Type 5C round smooth special accuracy collet with a through-capacity of 1-1/16 Maximum total indicator reading (TIR) of 0.0002 when held in a Hardinge Super-Precision Spindle External right-hand 1.238 x 20 draw bar threads are heat treated for long life Hardened and ground spring steel for accuracy and resistance to wear and breakage