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Milwaukee® 8 mm X 22 mm X7 mm Ball Bearing is designed for routers, 3.5 HP router, drywall screwdrivers, screw guns, impact wrenches, 1/2" impact wrenches, grinders, electric drills/drivers, 4 1/2" & 5" angle grinders, cordless 7/16" quick change impact wrench, cordless 7/16" hex impact wrenches, 8" metal cutting circular saws, 4 1/2" magnum sanders/grinders, super magnum sanders/grinders, 6" right angle grinder, adjustable clutch, power unit for 0 - 2500 RPM sharp-fire® screwdriver system, power unit for 0 - 4000 RPM sharp-fire® screwdriver system, 0 - 4000 RPM decking/ drywall and framing screwdrivers, 0 - 2500 RPM self drill fastener screwdrivers, 18 ga shears, 12" dual-bevel compound miter saws, routers, cordless 13 mm impact wrench, cordless 1/2"/3/4"/7/16" impact wrenches, adjustable torque screwdriver, 1 1/4- 2" & 1" - 1 5/8" sharp fire screwdriver with magnum attachment, sharp fires, 1 3/4 H.P D-handle router, 3.5 hp router, super hawg drills and 1/2" impact wrench with rocker switch and friction ring socket retention, 10 mm drill, 1/4" & 3/8" drill, O.E.M power unit, variable 3/4" D.I. impact wrench, cordless 13 mm impact wrench, 4 1/2" angle grinder, 125 mm dial speed super mag grinder, 13 mm drill with spindle lock, 115 mm mag grinder and power unit. Ball bearing helps to reduce friction between rotating parts. It has balls or rollers that take the load and spins evenly by distributing the weight to reduce friction by using the minimal contact area of the ball. It minimizes wear on the tool and allows it to run smoothly.