Its wide range of applications makes it possible to meet different work requirements. The ergonomic design makes it very comfortable to hold and non-slip. The small size and light weight make it very convenient to carry and store. And the equipped wrench allows you to install it more easily. Made of hard alloy and copper material, it is very durable to use. The length of this product is 13.1cm, the width is 2.4cm and the height is 2.4cm. It is suitable for punching ordinary density plastics and wood, such as model airplanes, car models, bamboo boards, ice cream sticks, chopsticks, bird cages, animal tooth bones, shells, PCB circuit boards, booklets, resin toys, drop film accessories, pearls, acrylic. The thickness of crystal, etc. should not exceed 8 mm. And most USB power adapters with 2A output can be used for power supply, Item Name: Micro Grinding Machine Material: Copper,Hard Alloy Product Plug: USB Rated Power: 15W Rated Speed: 12000 rpm Power Supply Voltage: 5V No-load Speed: 11000 rpm Drill Specifications: 0.8mm, 1mm, 1.2mm Features: Multi-purpose, Comfortable Grip, Non-slip Chuck Specifications: 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm Size Details: Grinding Machine: 13.1cm x 2.4cm x 2.4cm/5.16" x 0.94" x 0.94" (Approx.) Chuck Length: 1.65cm/0.65" (Approx.) Bit Length: 3.1cm/1.22" (Approx.) 3.8cm/1.5" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Micro Grinding Machine 1 x Drill Clamp 5 x Chucks 1 x Wrench 3 x Drill Bits 1 x USB Cable