There are basically three types of pockets used in the industry today. Each is unique in the way that it mounts to the table. #6 and #3 pockets both have the pocket cover wrapped around a metal iron that forms the shape of the pocket. The #6 has pins that insert into the end of each rail. A bolt is then inserted from the underside of the rail to secure the pocket. The #3 has pins which usually flush mount to the top of the rail. Many antique tables have #3 pockets. Both of these style pockets are exposed to the eye when looking at the table. They actually form a joint, which connects the rails. Because of the shape of the iron, they will play better than other style pockets.
Enclosed pockets are the third type of pocket. It is totally enclosed within the rail system. The pocket is actually inserted within a cutout inside the rail. It is usually used on very inexpensive style tables, commercial style tables, or modem style tables. These pockets are generally made of plastic or rubber, but may be leather on more expensive tables.
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