Description: This product is made of high quality stainless steel and brass design, compact and convenient, not only the appearance of exquisite appearance, as well as pen-like writing experience. It is mainly used for a variety of stone, wood, olive core, PCB circuit board, plastic, egg carving, grinding, rust, small parts of the dressing; can also be used on stainless steel, glass. Specofications: Condition: 100% Brand New Material: Stainless Steel Color: Silver No Load Speed: 32000rpm Rated Voltage: 3.7V Clamping Length: 20mm Bottom Diameter: 12.5mm Electric Pen Size: Approx. 122 x 12mm / 4.8 x 0.5" Package Weight: Approx. 259g Package Included: 1 x Electric Grinder Pen Set Note: 1. Please allow 1-2 cm error due to manual measurement and make sure you do not mind before ordering. 2. Please understand that colors may exist chromatic aberration as the different placement of pictures.