The Swisher 6.75 gross torque Walk-Behind String Trimmer is an ideal back-saving alternative to heavy handheld gas trimmers. Its wide 22-inch cutting swath rivals that of most lawnmowers, while its user-friendly design offers unsurpassed, precision trimming performance. The improved trimmer head features 4 strings/8 effective cutting lines and allows you to adjust your cutting height from 1.5 inches to 4 inches. For added safety, you can engage and disengage the trimmer head from the handlebar while the engine is running. Plus, the trimmer features 13.75-inch wheels for plenty of clearance and smooth rolling over rough terrain. The trimmer line is easily replaceable without the use of tools.