JINSE Bipod Adjustable 6-9 Inches Folding Spring Return with Sling Swivel Mount High tech durable aluminum construction , duty and light weight Adjustable 5 settings for different length, leg height: 6 to 9 inches (152mm-225mm). Posi-Lock legs provide extremely solid, exceptionally accurate support Foldable arm with spring tension control with the mount adapter. Durable with new design high quality that you can quickly attaches to sling swivel stud