This is provided with a brake on only one carriage. Normally the carriage with brake is mounted on the fixed rail so that it is locked into place enabling the mobile rail to slide. If the carriage with brake is mounted onto the mobile rail you obtain the opposite effect that is the sliding of the mobile rail gets blocked while the carriage can freely slide on the fixed rail.
This item is an ident item. We will order in for you when an order is recieved. Once ordered item can not be cancelled.