From the Manufacturer The Jacobs 17-Piece ER 50 collet set is measured in metric and includes 17 ER 50 collets 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34-mm. Each collet is precisely made to .01-mm TIR. The collapse range of each collet is 1.00-mm. The Jacobs 17-Piece ER 50 collet set can be used for milling, drilling and reaming and is suitable for CNC machines and machining centers with automatic tool changes. This Jacobs 17-Piece ER 50 collet set is laboratory certified and like all Jacobs chuck's products includes a one year factory warranty
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