This anesthesia cart adjustable shelf allows you to select the height of rail clip mounted accessories on the shelves and rails of your M-Series or A-Series cart. To adjust the height simply loosen the knobs to slide the shelf and rail to your desired height, then tighten the knobs to secure them back into position. What could be easier than that? Several shelf and rail variations are available to meet your needs. The MD30-ADJSHLF is an M-Series crossover for accessory 68034.