1、The collet is integrally formed with a long total length and is suitable for installation on a knife sharpener. 2、The clamping force is strong, and the clamping accuracy is 0.02mm, which is suitable for fine operation. 3、The accuracy of the aperture is high, the thread size is standard, and it is not easy to fall off during installation and use. 4、Different size specifications have different clamping ranges, which are suitable for different clamping situations. 5、Made of high-quality metal materials, the hardness is HRC40-45, and it is not easy to be squeezed by the outside world. 1 x 5mm Chuck Item Type: Sharpener ChuckModel: 3-9mm Grinding Machine ChuckHardness: HRC40-45Clamping Accuracy: 0.02mmClamping Range: Approx. 3mm / 0.12in, 4mm / 0.16in, 5mm / 0.2in, 6mm / 0.24in, 7mm / 0.28in, 8mm / 0.31in, 9mm / 0.4inCollet Total Length: Approx. 122mm / 4.8inCollet End Diameter: Approx. 20mm / 0.8inTail Thread: M20Tail Thread Length: Approx. 29mm / 1.1inRod Diameter: Approx. 20mm / 0.8in