Prime-Line Screen Door with Stainless Steel Roller, 2-Pack is a set of durable rollers designed specifically for screen doors. These rollers feature a V-spring design commonly used by Academy and other patio door manufacturers, ensuring compatibility and reliable performance. Each roller includes a 1-inch diameter stainless steel wheel paired with a 1-3/4-inch long tension spring made from heat-treated steel for long-lasting strength. The unique bent or angled flat spring design allows for easy height adjustment via an adjusting screw, making it simple to fine-tune the roller height for smooth door operation. I for replacing worn or damaged rollers, this 2-pack provides balanced support for both sides of your screen door, helping to restore effortless sliding functionality. Model Number: B 639