The Universal Snooker & Pool Triangle Black 50.8mm / 52.4mm / 57.2mmDescription This Universal Triangle is ideal for all 50mm British, 57mm American & 52mm Snooker Balls The Universal TR Triangle will work on all Billiard ball sizes (American Pool, Snooker and English Pool) because of its angled walls. These angled walls force the balls together to form the tightest pack possible, all while stopping the triangle from touching the baize, reducing any additional wear, making the Universal TR Triangle is the only rack