INPANOLS 23 Pcs ER40 Collet Set, 1\/8"-1" Precision Spring ER40 Shank Chuck for Boring, Drilling, Tapping, Milling Lathe Engraving Tool

23 Pcs ER40 Collet Set in Fitted Strong Aluminum Box, Size Included: 1/8'', 3/16'', 7/32'', 1/4'', 5/16'', 11/32'', 3/8'', 13/32", 7/16'', 1/2'', 17/32'', 9/16'', 5/8'', 21/32'', 11/16'', 3/4'', 25/32'', 13/16", 27/32", 7/8", 15/16", 31/32", and 1". | ˜…TRUE DOUBLE ANGLE for Better Accuracy, Concentricity within TIR 0.0004". | ˜…ECCENTRIC DESIGN: The inside of the ER40 collet nut is intentionally designed like off-centering to help mount the ER40 collet much easier. | ˜…HIGH HARDNESS: Made of high-quality alloy spring steel and hardened to HRC 44-48 and all critical surface is precision ground. | This collet size is true imperial fractional size, not a metric converting size and the surface on this collet has been specially treated to increase its tool life.