About Trinity The motto at Trinity is "Everything in its place." They"re devoted to creating places to keep your things, knowing that organization is the key to improving all things. With tools, utensils, supplies, and just about anything else in your home or workplace sorted, safe, and in-sight, you"ll be amazed at what you can accomplish. This competitive, socially responsible company is a great go-to for all things storage. Made of durable steel. 2 locking and 2 non-locking casters. Easily make your existing rack mobile. Casters recommended for TRINITY shelving. Dimensions: 4L x 2W x 4H inches.