High Precision 57 Pc. Round 5C Collet Set 1/8-1" x 64ths Hardened T.I.R. 0.0005" Lathe Our Part # ALL-41284 High precision 57 piece fractional 5C collet set includes 1/8-1" x 64th increments Made of high grade tool steel. Hardened and precision ground. Threaded internally and externally Guaranteed T.I.R. 0.0005"