thkfish Quick Release Mount Bipod Sling Swivel Adapter w/Weaver Picatinny Rail 20mm HMB005 Fits onto Weaver or Picatinny accessory rails such as RAS, RIS rails Quick detachable design with easy cam locking lever for fast installation and detachment Rotatable sling swivel 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 swivel stud Adapter body is made of aluminum alloy. Swivel stud is made of steel Anodized in matte black finish Length of adapter: 2inch Weight: 2.6oz