The GrovTec Multi-Adaptor Quick Detach Sling Swivel Stud adds function to push button swivel bases. Use the supplied allen wrench to depress the plunger and slide the stud into the base. The standard stud is ready to accept all swivel types and/or mounting of a bipod or accessories that require a sling swivel stud. Fits all standard push button swivel bases. Includes 2 multi-adapters and 2 stainless steel bases.