The Alvin Rotatrim 49" Power Trimmer is powered electrically and employs the best components of the Technical trimmer series plus a cutting head that's belt-driven. The trimmer is capable of slicing through heavy workloads on a continuing basis. The features of the trimmer include a powerful self-sharpening cutting wheel made of tungsten steel that easily slices through thick and heavy materials. The cutting head is powered by a foot-operated pneumatic switch electric motor that leaves both of the user's hands free to better position the materials to be cut. The cutting speed is 20 inches a second with 16 lbs./inch torque. This Alvin Rotatrim Power Trimmer has a very user-friendly modular circuit design. Additionally, models 1550 and above come with baseboard extension rods for supporting large materials. The depth extends to 28" by sliding the rods into the aluminum baseboard. All sizes of the Power Trimmer are shipped in wooden crates. All Rotatrim trimmers are guaranteed for five years not to have any defects or faulty materials. Cutting blades, clamstrips, or other plastic and rubber parts are not covered by guaranteed due to their normal wear and tear.