"A handle-like device that is attached (clips or is slid onto the cylindrical barrel) to an electrically- or pneumatically-powered surgical power tool handpiece or motor of the micro types (a drill or a saw) so that the two devices interact to function as a switch used by the operating surgeon to hand activate (start and stop) the handpiece/motor. It is typically made of metal and/or synthetic materials and will typically include a sliding lock that, when brought into use by the surgeon, will lock the handle in the ""On"" position. This is a reusable device."