The Predator QR Pool Cue Extensions pair with any Predator Cue equipped with the Uni-Loc® Weight Cartridge System. Once installed the quick releasing extension adds additional butt length with a single turn of the extension handle. Simply remove your existing rubber bumper, install the Uni-Loc® QR Extension2 bumper using a standard 6mm allen wrench, twist on the QR Extension2 handle and you’re ready to go. Available in 3-inch, 8-inch, or 12-inch length.