Allstar ALL10219 Spring Loaded Round Tube Type Window Net Installation Kit for Border and Loop Style Nets Spring-loaded tube type Includes a 9/16 inch spring loaded top tube and a 3/4 inch flat aluminum strap Designed for most border and loop style nets Eliminate welding by using Allstar clamp-on kit 10221 (1-1/2 inch round tubing) or 10222 (for 1-3/4 inch round tubing) which are sold separately It has a 90 day limited warranty