Trigger Switch with Lock-On Button (AC/DC) Labyrinth construction features a complex series of channels to prevent penetration of dust and debris into the field and armature for maximum operational life Motor winding protection features "Zig-Zag" varnish on the armature and hardened powder on the field coils to act as an impenetrable barrier to dust and debris Rotatable gear housing can be positioned at every 90o for optimal positioning Removable side handle can be mounted on left or right side of tool Ergonomic soft rubber grip design for vibration absorption and comfortable operation