Item Type: Sharpener Chuck Model: 10-16mm Grinding Machine Chuck Hardness: HRC40-45 Clamping Accuracy: 0.02mm Clamping Range: Approx. 10mm / 0.39in, 11mm / 0.43in, 12mm / 0.47in, 13mm / 0.51in, 14mm / 0.55in, 15mm / 0.59in, 16mm / 0.63in Collet Total Length: Approx. 122mm / 4.8in Collet End Diameter: Approx. 20mm / 0.8in Tail Thread: M20 Tail Thread Length: Approx. 29mm / 1.1in Rod Diameter: Approx. 20mm / 0.8in 1The chuck has a large clamping force, which can be clamped quickly and operated stably. 2The hole diameter and thread have high accuracy, standard size, and it is not easy to fall off after installation. 3The 122mm lengthened design is convenient for installation and removal on tools. 4Made of high?quality and high?hardness materials, anti?impact and wear?resistant, and can be used for a long time. 5Different size specifications have different clamping ranges, which is more practical.1. Put each type of chuck into the corresponding diameter tool to avoid damage to the chuck because the diameter of the tool exceeds the size of the chuck model. 2. When changing tools, clean up the impurities inside the jacket in time to ensure the service life of the chuck.1 x 12mm Chuck