Montgomery Ward/H.B. Sherman Mfg. model 2000 TSM-A traveling sprinkler. The all-aluminum sprinkler has a spray-arm span of 22", 9" all-terrain wheels, and all metal gearing. The two wheels are interchangeable from side to side depending on whether you want it to go "fast" or "slow", those being relative terms. Sprinkler is in overall great shape!!