SJS (Super Joint Systems) help prevent gear damage!
Advantages of SJS
An innovation from Makita engineering where the motor armature and spiral bevel gear are linked by a coil spring. When the motor armature rotates, the coil spring tightens around the gear and the grinding wheel spins (up to 11,500 RPM).
What makes it so good?
If the grinding wheel ever catches or binds, the coil spring relaxes and disengages the gears from the motor. The grinding wheel stops, the gears and motor are protected.
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