SSF-2751-A Swivel construction highest quality metal and has been fully chrome plated with reduced friction. The swivel has multiple ball bearing action to provide you with consistent and smooth performance even through intensive daily use. It comes with a removable base so you can change the ball quickly and easily. Chain link security makes bag almost theft proof. Quick change, push pin style, extra heavy duty model lightning fast for pro use. Sealed inner ball-bearings make for super quiet and super efficient action. SSF-2751-B Swivel Ball bearing construction high-speed bearing quality metal and has been fully chrome plated. The swivel has multiple ball bearing action to provide you with consistent and smooth performance even through intensive daily use. A locking device securely holds the striking ball in place. It comes with a removable base so you can change the ball quickly and easily. Chain link security makes bag almost theft proof. SSF-2751-C Swivel highest grade metal and sealed precision triple chrome plated and has a heavy duty flange and mounts securely to the platform. Removable base for quick ball changes, quick locking clip for striking ball.