Description Rain Bird's popular line of polymer impact heads proves that it continues to lead the industry in engineering and design innovation. Modeled after their top-selling brass impact line, these impact heads are crafted from high impact, heavy-duty polymer providing years of reliable watering use.Specifications:Durable high-impact polymer and stainless steel construction.Full and part circle coverage, with infinite pattern adjustment.Weighted arm for slower rotation and better watering coverage.Straight through flow for superior performance in dirty water conditions.PJ arm controls water stream, avoids water waste and side splash.Full or part circle operation 360 Degree or 20 to 340 Degree.Removable, bayonet nozzle for maximum easy cleaning.