The Mobile Carts 6124-30M, 6094-45M and 6094-60M are designed for easy storing and transportation of 30 min., 45 min. or 60 min. SCBA bottles. Individual spacing, positive bottle placement, and weight distribution allows for easy handling over uneven, or irregular surfaces. The all-welded steel construction of angle iron and steel round bar provides greater durability and strength. The plastic bumper guards eliminate noisy rattling while in transport.