Variable Speed, All Ball-Bearing Motor For Increased Power When Cutting 5/16" Cement Fiber Siding, Head Swivels 360 Degrees, Reversible Dual Cutting Edge, Replaceable Center And Side Blades. Specs: Max Watts Out 800W, Strokes/Min 0-2,500 SPM, 9.1 Long, Weighs 4.5 Lbs.