Happu-store(TM) Tactical Picatinny Rifle Sling Weaver Rail Hook Adapter Attachment Scope Mount Material: Aluminum, Color: Black Weight: 14g, Size: 31x12x20 mm (LxWxH) Easy to install, Suitable to mount to any 20 mm picatinny and weaver rail Package Contents: 1 x Mount +1 x Allen Key