SJS (Super Joint System) prevents kickback during wheel lock up for optimal tool and operator protection Soft start feature gradually increases speed to eliminate start up shock Constant speed control maintains constant speed under heavy load Variable speed dial allows operator to adjust speed based on materials or application 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 Standard equipment side handle provides maximum operator control during operation