The General Tools Cordless Precision Engraver enables precision cordless engraving from professional Technicians and Mechanics to Homeowners And Diyers. Users can protect all types of valuables with identifying markings and perform delicate personalization of items - engrave tools, sporting goods, toys, phone chargers and personalize jewelry, watches and glassware. Engraving Diamond Tip Bit- using a standard 3/32-inch engraving diamond tip bit and safe fingertip controlled on/off switch. Holds like a pen- compact engraver has ergonomic tri-lobal grip and precise fingertip control; etching tool has a lightweight aluminum body. Power- Engraving pen has a 20,000 RPM Motor to engrave glass, metal, ceramic and plastic, only using two included AAA batteries. Length: 6-1/2 in. Width: 1/2 in.