Weight bolts for McDermott’s 11 inch cue extension. These are known as the ‘slim’ style weight bolts at a 1/2″ diameter, and include a threaded hole for the McDermott 11″ extension. All are removable from the bottom of the cues and are not stackable. You can change the weight bolts by using a 1/4″ hex head, or an allen head wrench.