Spring Steel Material: er11 collet set is made of 65Mn spring steel material, fine workmanship, good elasticity and high . Our cnc spindle collet set is used for CNC milling lathe tools and workpiece clamping engraving machine Er11 Collet Set: Er11 collet has a height of about 18mm / 0.7inch, an outer diameter of about 10mm / 0.39inch, and a runout tolerance of 0.015mm. Spring collet chuck set has 15 different sizes for a range of applications Hand Engraved Marking: The router collet kit has hand engraved size markings, you can easy to identify and store the tapping machine collets, also easy to distinguish the size of the workholding collet tools when using them. With Storage Box: Each spring collet has a yellow storage box, which is marked with the size and type of the collet. The storage box of the independently packaged CNC spindle collet can be carried individually when needed, and it does not take up space in the tool box, Weight: 0.28108938405 pounds, Manufacturer: Ehwisbe