They can be attached to the bottom of the crate, making them easy to move around. Suitable for medium and large dog crates This wheel kit allows you to move your transport crate quickly. The wheels can be fitted in an instant, thanks to the special screws and easy assembly instructions included in the packaging. Depending on the model of dog carrier you own or intend to buy, you'll find the most appropriate kit. The L388 kit is perfect for large transport crates, such as theAtlas 70. All kits contain 4 wheels, 2 fixed wheels and 2 swivel wheels with brakes.