surface rust treatment,durable,passed hardness and anti-crack test Model: NT30 ER32. 1 x ER32 Wrench. FOR CNC DEVICES: The tool holder has high accuracy and is widely used in CNC machining center and engraving machine, etc., convenient and durable Short delivery, high quality, we have any specifications of the product, you can contact us to ask some of the product custom. ER Collet Holders | Maple Tools CNC Toolholder BT30-ER16-70 Arbor Hardened Alloy Steel CNC Milling Toolholder,Surface Rust Treatment,Durable,For CNC Milling Lathe Precision Ground CNC Tool All critical surfaces are hardened and precision ground Material: hardened alloy steel. Application: suitable for milling machine and CNC machining center. All critical surfaces are hardened and precision ground Easy to change/set up and low maintenance Surface rust treatment, durable, hardness passed and anti-crack test. See more product details Report an issue with this product Application:Fit for milling machines and CNC machining center In addition, we sell the world's various brands of CNC blade Machine accessories, tap, die full range of specifications.