Ideal for mobile storage requirements. Allows air to circulate throughout, eliminating dust and dirt build-up. Allows you to keep linens, food items, stocked products and other regularly used items on hand, throughout the workplace. Locking post collars are recommended for rough use over the road vibration and jolting. Order one per shelf Truck consists of 4 posts, 4 shelves, plastic shelf clips, donut bumpers and swivel casters. Posts are 63"H. 5"polyurethane stem casters that have a 1200 lb. load capacity and is 69" overall height or 8" full pneumatic stem casters with a 1200 lb. capacity and is 72" overall height.