Description This collet clamping nut is made of premium material, which can withstand long-lasting use. Features the chromium steelmaterial, which has high durability, not easy to deform. Fine workmanship, ensures practicality. This collet clamping nutwill make the repair and fix easier and smoother. Features -Color:Black-Material:chromium steel-Size:1.80X1.80X1.30cm/0.71X0.71X0.51inInner thread: 14mmNut pitch: M14x0.75External diameter: 19mmSuitable collet: ER11-ASuitable wrench: 17mm- Made of chromium steel, it is strong and durable, not easy to break.- All collet clamping nuts have balancing holes to prevent wear and noise.- High accuracy and concentricity, prolong the service life of the spindle and reduce the breakage rate of the drill bit.- It is suitable for ER-type tool holders, tool bars, extension rod nuts to hold drills, boring tools and other tools.- Exquisite workmanship, reasonable structure, professional and practical, can bring you convenience.Packing list: 4 x clamping nuts