A merchandising system includes an elongated mounting member having a wall with at least one tooth and a cooperating member having a front end receivable on the mounting member. The cooperating member can include a slot defined in the front end. A lock is received in the slot. The lock includes at least one tooth located at a first end and a resilient member located at a second end. The lock can selectively engage the mounting member so as to retard or permit a lateral movement of the cooperating member in relation to the mounting member.