General Tools 505B Replacement Bit for 505 Engraver, 1 Bit The 505B is a replacement Bit for 505 engraver, this new and exciting tool enables precision cordless engraving anywhere by anyone from professional technicians Users can protect all types of valuables with identifying markings and even perform delicate personalization of items Designed in-house by Generals engineering team (Patent Pending) Engraving tool has a 20,000 RPM Motor to engrave glass, metal, ceramic and plastic Engraving pen has a precision fingertip control with ergonomic tri-global grip; etching tool has a lightweight aluminum body