29 Pc R8 Collet Set Fractional 1/32" - 1" High Precision for Bridgeport Our Part # ALL-41055 High precison 29 piece set includes 1/32-25/32", 27/32 and 1" R8 collets Made of high grade tool steel. Hardened and precision ground. Threaded internally 7/16"-20 Guaranteed T.I.R. 0.0005"