GrovTec US Inc Multi-Adaptor Swivel Stud Adaptor Set - Black - Add function to push button swivel bases with the ingenious Multi-Adaptor. 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. Fits all standard push button swivel bases. Set includes two Multi-Adaptors and two stainless steel bases. ONLY FOR FULL ROTATION BASES, DO NOT USE ON NON-ROTATING OR LIMITED ROTATION MOUNTS Includes allen wrench, two adaptors and two bases