SJS spring clutch protects the operator from accidental wheel lock. Low speed type with very high torque is ideal for grinding and finishing work using brushes, flap discs and points. SJS system to minimize kickback. Zig-zag varnish on armature and powder coating on field to protect motor from abrasion. Labyrinth dust proof construction prolongs tool life. Electronic constant speed controller with soft start and variable speed dial. Comes standard with side handle for excellent operator control.