The inventor of Draft Shaft noticed beer tap handles have a common threaded hole, designed to screw onto a 3/8-16 UNC bolt. This bolt is the standard used on beer faucets. Regular pool cues are incompatible with this bolt.
The Details
Two-piece pool cues are commonly used to play pool. The two pieces can be unscrewed to disconnect the shaft, which is the thin part of a cue with the tip. But, regular pool cues are incompatible with beer tap handles because they use a different size bolt. Trying to attach a beer tap handle to an incompatible bolt will damage your tap handle or pool cue. Drat Shaft solves the connection problem, with a 3/8-16 UNC threaded bolt extending from its shaft.

Every Pool Table Needs a Short Stick
Millions of us play pool on recreational tables at home, in bars and pubs. Pool tables often don't have full clearance on every side. The short pool stick was invented to overcome obstructions such as a wall or pole.
A short cue lets you play pool even when there is a less than ideal amount of space. Until Draft Shaft, most short cues were plain, usually too lightweight, and a bit boring.
Draft Shaft proves short cues don’t need to be boring!
Draft Shaft adds a beer tap handle to a cue shaft to create a fantastic short cue with looks, balance and personality. Any standard North American tap handle attaches to a Draft Shaft cue.
Draft Shaft can also be used as a "jump cue" to cause the cue ball to leap over other balls in the way of your target ball. Every pool table needs a short cue.