Joint Protectors, also known as Joint Caps, are a must have for any pool cue owner. When you break your cue down, even if you’re storing it in a good case, your collar, joint and pin are still exposed. A good joint protector set will protect these essential parts of your cue, extending the overall life of your cue. Thread pattern: 3/8 x 11.Features:3/8×11 Thread PatternProtects your collar, joint, and pinHelps extends the life of your cueAcrylic materialDouble check your cue to make sure you have the right pin size as they vary by cue manufacturer