Quick Release Cam Lock QD Bipod Sling Adapter for 20mm Picatinny Weaver Rails Quick detachable design with easy cam locking lever for fast installation and detachment Fits onto Weaver or Picatinny rails such as RAS, RIS rails Rotatable sling stud built in is perfect for mounting bipods or attaching to sling swivels Works great with Harris bipods or any other bipods that mount onto standard sling stud Fits all Standard 20 mm Picatinny Rail.