GrovTec US Swivel Stud Multi-Adaptor Set Black. Use supplied allen wrench to depress plunger and slide into base. Standard stud is ready to accept all locking swivel types that require standard studs. Specifications for GrovTec US Swivel Stud Multi-Adaptor Set: Manufacturer: GrovTec US Color: Black Fabric/Material: Stainless Steel Gun Type: Rifle Gun Model: Universal Condition: New Features of GrovTec US Swivel Stud Multi-Adaptor Set Fits all standard push button swivel bases. Only for full rotation bases do not use on non-rotating or limited rotation mounts. Package Contents: GrovTec US Swivel Stud Multi-Adaptor Set 2 Multi-Adaptors 2 Stainless Steel Bases GrovTec US GTSW299: Swivel Stud Multi-Adaptor Set Black