I found this while cleaning my house, and I don't know much about it since I don't play billiards. According to my online research, it appears to be a weight bolt set for adjusting the weight of a cue from Predator, a billiards manufacturer. The case contains: * A T-shaped tool * Metal bolts of various sizes * Cylindrical metal parts (Everything in the photos is included) I don't know the exact specifications or how to use it, so I'm offering it to someone knowledgeable about billiards or someone who is looking for this. Please check the condition in the photos. Please purchase only if you understand that it is a used item. Immediate purchase is OK. Thank you!