The mounting bracket is made of high-quality stainless steel and is durable and resistant to breaking. The wheels are solid nylon, not hollow, providing strength and resistance to deformation. The smooth nylon material allows for easy movement. Universal Patio Heater Wheel Kit replacement parts size: Product Length = 7.8 inches, Installation Spacing = 3.93 inches. This wheel kit is compatible with most patio heaters. The solid wheels are durable, ensuring a long service life. Easy to install: The wheel set comes pre-assembled, so no additional installation is required upon receipt. Simply attach it to your patio heater. The design allows for quick setup and low maintenance. Wide application: Universally fits most patio heaters with a round base, including outdoor mushroom and umbrella-style heaters. Compatible with many major patio heater models, enabling easy mobility. Move your heater conveniently around your yard, patio, office, or other outdoor spaces. Color: As shown Material: Stainless steel Package Contents: 2 x Wheels, 2 x Mounting Brackets, 2 x Nuts, 2 x Bolts Note: Light reflection and differences in display screens may cause slight variations between the color in the image and the actual product. Measurement may vary by +/- 1-3 cm.