Five-stage, foam-paper-nylon system with advanced directional air flow provides very clean air for better saw performance. Reinforced aluminum blade guard with 70 degree range of limitless positioning using a marked knob handle. Improved ignition system with larger flywheel and rare earth magnets for more power. Specs: engine displacement (cu.in.) 4.5, 5.7 max. power (hp), 9,350 no load rpm, 50:1 fuel mixture with 37 oz. fuel tank capacity, 4,300 max. spindle speed, 14" wheel diameter, 20 mm arbor, max. cutting depth is 4-13/16", weight 22 lbs. Includes: 14" abrasive wheel, universal wrench, torx, screwdriver, adapter ring (20mm to 1").