MT3 Shank ER32 Collet Chuck Tool Holder with 11Pcs ER32 Collet Set Fit for CNC Engraving Machine and Milling Lathe Tool (MT3 ER32) Specification: Accuracy to 0.0005". ER32 clamping range: 1-20mm. Imperial draw bar threads: 1/2"-20 Suitable For: High accuracy collet chuck system suitable for all milling and drilling applications. Collet Sizes: 1/8-3/4 by 16th (1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4"). Advantage: Performance stability, high accuracy. Packing Included: 1 x MT3 ER32 Collet Chuck 1 x Wrench/Spanner 11 x ER32 Spring Collet Set