NCSTAR 1in Lockable Sling Swivels Black. NCSTAR Swivels come with easy to use instructions. This NCSTAR 1" Lockable Swivels features metal construction and are painted black. Specifications for NCSTAR 1in Lockable Sling Swivels: Manufacturer: NcSTAR Color: Black Features of NCSTAR 1" Sling Swivels: 1" Lockable Sling Swivels Mounts onto most Standard Sling Studs found on most Hunting Rifles and Shotguns. Package Contents: NCSTAR 1in Lockable Sling Swivels NCSTAR AASW1B: 1in Lockable Sling Swivels Black