This product is a collet clamping nut, which is made of chromium steel material, with good texture, safe and practical. Easy to install and use, it can be easily applied to your collet. It is a very practical accessory that will meet your needs well. Features -Color: Black -Material: chromium steel -Size: 1.80X1.80X1.30cm/0.71X0.71X0.51in Inner thread: 14mm Nut pitch: M14x0.75 External diameter: 19mm Suitable collet: ER11-A Suitable wrench: 17mm - Replace your old or broken collet clamping nut with a new one. - Widely used in drilling, boring, milling, tapping, , CNC router lathe, etc. - Put the circlip into the nut, turn it slightly, the eccentric part with the nut is recessed into the groove of the circlip, push the circlip evenly, and then it can be installed in the nut. - Install the retaining ring together with the nut on the chuck body or the machine tool spindle. Clean the cylindrical handle of the tool and put it into the clamping hole. Use a wrench to tighten the nut evenly until the tool is clamped firmly. - When changing the tool, use a wrench to loosen the nut to bring out the chuck and the tool, remove the tool, push the circlip forcefully to make it exit, and then replace the circlip with other hole distances as needed Package list: 4 x clamping nuts