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Check the listing for details. High Accuracy ER40 21mm Collet Chuck Drill Engraving Holder. Condition: New. Listed at 16.97 USD. Feature: Quality 65MN Materials Production, with good flexibility and abrasion resistance after heat treatment ER40 Series Spring Collet Chuck Tool Bit Holder Clamping force, high accuracy, good stability and grip. Can be used for holding drills, boring tools, chisel, reamers and other tools. Material: 65Mn Size: Out dia : 41mm Height: 46mm Available Hole dia: 21mm Package included: 1 x ER40 21mm Spring Collet Chuck Tool.