The MidWest Homes for Pets Universal Crate Casters in black are designed for pet crates, specifically catering to dog owners. This pack of 2 casters is compatible with various pet crate sizes, offering a convenient way to transport and move crates with ease. Made by Midwest, a trusted brand in pet supplies, these sturdy casters provide stability and smooth mobility for pet crates, making it easier to move your furry friend's living space whenever needed.