Hardinge 5C Round Serrated Collet, 0.902" Hole Size Collet for holding workpieces in a lathe or other machine tool Type 5C round serrated collet with a through-capacity of 1-1/16 Overall length of 3.281 and a back bearing diameter of 1.250 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