Diamond Billiards 501, 502 and 503 Locks are essential for securing the interior of your Diamond Smart Table. Each coin door requires both a 502 and a 503 lock for proper installation, while the side panel access door only requires a single 502 lock.  The 501 Lock is used on older smart as a free play switch. Each lock comes with two keys and includes the necessary hardware to secure the locks to the door. Designed for durability and reliability, these locks ensure your table remains secure.