The balance precision of the product is higher than that of the common nut.Extend the service life of the nut, improve the durability, better ensure the use of the machine, and enhance the anti-wear and anti-friction.Buy now. _x000D_ _x000D_ Features: _x000D_ 1. Suitable for ER type tool handle, tool bar, extension bar nut holding drill bit, boring cutter and other tools. _x000D_ 2. Strong clamping force is not easy to deform. Hardened and precision ground.Black Oxide Finish. _x000D_ 3. This collet nut is a great replacement for the broken part, fit most tool holders. _x000D_ 4. Very wear-resistant, high corrosion resistance, so very durable. _x000D_ 5. Suitable for ER25 chuck, tool handle and tool rod. _x000D_ _x000D_ Specification: _x000D_ Condition: 100%brand new _x000D_ Material: 42crMo _x000D_ Weight:130g _x000D_ Color: black/white _x000D_ Size: 4.5*4.5*2.5cm/1.77*1.77*0.98inchapprox _x000D_ 1mm=0.039inch(approx) _x000D_ Color: nut thread : nut diameter(mm) nut height (mm) _x000D_ black m32*1.5 42 21 _x000D_ black m32*1.5 42 lengthen _x000D_ white m32*1.5 42 21 _x000D_ _x000D_ _x000D_ Package list: _x000D_ 1*Collet Clamping _x000D_ _x000D_ Notice: _x000D_ Please Check Pictures and Specifications for Compatibility. _x000D_ Due to the light and screen difference, the item's color may be slightly different from the pictures.