This product is a set of four 4" x 1-1/4" rigid casters with hard rubber wheels. The overall height of each caster is 5 inches, and they feature a roller bearing for smooth operation. The unbranded/generic casters are designed for material handling in a business or industrial setting, providing stability and durability with their rigid construction and hard rubber wheels. This set of casters does not include any custom modifications or non-domestic features, making them a straightforward and reliable choice for various applications.