The Milwaukee 4 1/2in. 11 Amp Grinder delivers best in class durability and power. High-capacity 120V motor with Advanced Airflow system and electronic clutch runs at 11,000 RPM to handle the most demanding grinding jobs. Paddle switch can be locked on for extended operation. Speed RPM 11,000, Cord Length ft. 8, Spindle Lock Yes, Spindle Thread Size 5.8in.-11, Side Handle Yes, Amps 11, Switch Type Locking paddle switch, Wheel Diameter in. 4 1/2, Case Included No, Variable Speed No, Wrench Included Yes, Wheel Included Yes. Advanced Airflow system maximizes airflow and reduces debris ingress, improving motor performance and life Electronic clutch Overload protection 5/8in.-11 spindle thread size Needle bearings Paddle grip with locking paddle switch 100 tool-free grinder - no wrench or screwdriver required Easy changing of all accessories Easy installation and adjustment of guard
A angle grinder with a lock on switch would be preferred. If you are going to be using a it for long periods of time you will want the lock out. If you are going to be using it infrequently, the lock on feature is not necessary.