ONLY FOR FULL ROTATION BASES DO NOT USE ON NON-ROTATING OR LIMITED ROTATION MOUNTS.Add function to push button swivel bases with the ingenious Snap Hook Multi-Adaptor. Use supplied allen wrench to depress plunger and slide into base. Snap hook Multi-Adaptors conveniently convert push button bases to accept snap style hooks. Fits all standard push button swivel bases. Set includes two Multi-Adaptors and two stainless steel bases.