Reduce the risk of bending the joint pin and collar from impact damage when your cue is broken down with a joint protector. This is the number one way to protect your investment from damage. Durable and light weight aluminum two-piece (1F/1M) joint protector sets made to fit 5/16×18 joint pins. Fits most Meucci/Players/Viking cues.Features:Durable and light weight aluminum two-piece (1F/1M) joint protector sets made to fit 5/16×18 joint pins.