The TAS Trimmer blade mounts on any straight shaft line trimmer (2 or 4 cycle engine only). Once installed, the TAS Trimmer is ready to trim grass away from sprinkler heads, valve boxes, yardage markers and tee markers in a flash. The job of irrigation maintenance that once took days of back breaking work can now be done in just hours. The amount of time and energy saved is so great that it's nearly immeasurable.