- Function and scope: A versatile accessory for repair, maintenance and care of pool cues, billiard cues, and snooker cues. A practical gift for players, friends or anyone who loves billiards. - How it works: The straightness tester checks shaft straightness. Roll the shaft by itself and look for wobble; a true straight shaft will roll smoothly without movement. - Portability: Lightweight and compact design, easy to carry in a cue case or bag for practice, travel or on-site checks at home, club or tournament venues. - Material and durability: Made from acrylic for reliable, stable performance. Suitable for checking pool, billiard and snooker shafts and cues. - Benefits: Helps maintain consistent cue performance, reduces miscue risk and can extend cue life by identifying bent or warped shafts before use. - Use scenarios: Routine home maintenance before practice sessions; cue inspection and prep for tournaments or league play; a thoughtful gift for billiards enthusiasts.