- Rear handle trigger switch with no lock-on feature; lock-off feature requires two actions to start the grinder
- Redesigned motor with greater armature stability and larger commutator bars for 3 times longer life compared to previous model 
- Zig-zag epoxy on both sides of the armature coil and a powder-coated field for added protection from dust and debris for longer motor life 
- Labyrinth construction seals and protects the motor and bearings from dust and debris for longer tool life 
- Spiral bevel gears for smoother rotations and a more efficient transfer of energy