Features and Benefits:Internal governor maximizes speed under load, thus increasing your productivitySafety Throttle Lever to prevent accidental start upsSafety Disc cover for protectionAluminum alloy housing is rugged yet lightweightPowerful high performance motor for fast, efficient grinding in tight quartersFree speed 12,000rpmHardened and ground spiral bevel gears for low vibrationDead Handle Mounts on either side for right or left hand operationSP-1257 is perfect choices for high performance material removal. The 5" ( 125MM) respectively, air angle grinders combine a unique internal governor with a powerful 1.00 hp motor, to give you the best-in-class power to weight ratio grinders that will maximize your rate of material removal.