Features: * The drill chuck is made of high speed steel, which has high hardness, wear resistance, good toughness and toughness, and heat and corrosion resistance. * Adjust the speed of the regulator to the lowest or zero revolution, then turn on the power to adjust the speed, but the speed is not very high. It is best not to exceed 10,000 rpm, otherwise it will bend the rear axle.* Available in electric grinder, nail polish machine, engraving machine. Specification: Product Name: Drill Chuck Material: HSS Color: Silver Shank Diameter: 3mm Clamping Range: 0.3-3.4mm Size: (Approx.) 5.1*1.4*1.4cm/2.0*0.6*0.6" (L*W*H) Suitable for: Electric grinder, nail machine, engraving machines. Quantity: 1 pc Package includes: 1 drill chuck Note: 1. Transition: 1cm = 10mm = 0.39 inch. 2. The actual colors of the item may be slightly different from the pictures shown on the website of due to many factors such as brightness of your monitor and light brightness.3.Please allow slight manual measurement deviation of the data.Made of high quality material, durable and practical to use.