SKIL SHD77M-73 7-1/4-Inch Magnesium Worm Drive Circular Saw, Twist Lock Powerful 15 amp motor and durable worm drive gears for pro performance and long life Light magnesium housing (2 lbs. lighter) reduces user fatigue "Impact Resistant" Carbide Blade for optimal use Push button spindle lock for easy blade changes Anti-Snag Lower Guard Reduces Snags When Making Narrow Cut-Offs