7-inch compact & durable aluminium body Precision 332 diamond tip engraving bit Engraves on ceramic glass metal & plastic mediums 20000 rpm motor ideal for marking jewellery tools sports goods toys & other valuables Ergonomic grip allows for comfortable use Momentary onoff switch for safety Batteries 2 x AAA included Mark & protect the identity of your valuable possessions with the Cordless Precision Engraver. This specialty tool has a slim 7-inch compact & durable aluminium body & uses a 332 diamond tip engraving bit -- enabling you to engrave & personalise even your most fragile possession. Easily mark a variety of mediums including ceramic glass metal & plastic using the Cordless Precision Engravers 20000 rpm motor. The ergonomic grip offers ease of operation while marking jewellery tools sports goods toys & other valuables.