Product Description Makita’s 4-1/2” 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, with soft start for smooth start-ups. 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. In addition, the “tool-less” wheel guard adjustment provides easy clamping. 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. From the Manufacturer This powerful 7.5 Amp Makita angle grinder has an exclusive labyrinth construction that seals the motor and bearing from contamination.The 9557NBX features a switch (AC/DC) that is conveniently located on the top of the motor housing and a small circumference barrel grip for easy handling. 4-1/2" Angle Grinder AC/DC, 7.5A Motor For Heavy Professional Grinding Applications, Spindle Lock For Easy Wheel Changes, Small Circumference Barrel Grip For Easy Handling, Side Handle Can Be Installed On Either Side Of Tool For Operator Convenience, Switch Is Located On Side Of The Motor Housing; Lock-On Feature, Grinder Includes: 4-1/2" Grinding Wheels, Side Handle & Wheel Guard, Includes Extra Diamond Wheel and carry case.