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 dimensions: 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 and requires no additional installation steps upon receipt. Simply attach it to your patio heater for quick setup. Low maintenance and user-friendly. Widely applicable: Designed to fit most patio heaters with a round base, including outdoor mushroom and umbrella-style heaters. Compatible with major patio heater models, allowing easy mobility. Move your heater effortlessly to different locations such as your yard, patio, office, or room. 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 of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.