Makita's 4-1/2 in. cut-off/angle grinder combines 7.5 AMP power with comfort and motor-protection features for longer-lasting industrial performance. The 9557PB angle grinder delivers 11,000 RPM. The cut-off/angle grinder also features a range of durability features including labyrinth construction which seals and protects the motor and bearings from dust and debris for longer tool life, as well as a protective zig-zig varnish engineered to seal the armature from dust and debris. Ease-of-use features include an extra large paddle switch for comfortable operation and a lock-on/off feature for continuous operation. The 9557PB weighs only 4.5 lbs., with a side handle that can be easily installed on either side of the tool. This grinder also has an AC/DC switch for use with alternative-power sources. The 9557PB is a versatile and powerful grinder engineered for cutting, grinding and polishing applications. The 9557PBX1 is a kit that includes the angle grinder, 5 4-1/2" grinding wheels, metal tool case, cut-off and grinding wheel guards, as well as a Makita diamond blade with turbo rim engineering for constant contact with material for a smoother cut and finish.