Threaded bumper adapters are to replace existing bumper on your cue

These bumper adapters have a center hole to fit a 5/16 x 18 pin and are meant exclusively for the unbranded extensions sold through Budget Billiards.

Bumper Adapter with insert to fit:
Lucasi Cues post-1990's
Old Style Meucci with Pill style bumper with (no weight tube) and
Old Style Fine thread 3/8 x 18 thread weight system

*Joss Viking and Current Meucci adapters utilize the cues weight tube