The Dorman 602-230AS Windshield Wiper Motor And Transmission is a specific fit, one piece assembly designed for Sierra Silverado trucks. Made of galvanized steel and rubber, this mechanical wiper linkage and motor assembly includes 1 wiper transmission and 1 motor. With a clock-wise rotation direction, this natural color windshield wiper linkage and motor assembly features a frame material of galvanized steel and a wiper arm pivot point diameter of 0.43 inches. It comes with bolt-on attachment type and has a material thickness of 0.873 inches. This high-quality Dorman product ensures efficient and reliable windshield wiper function for your vehicle.