Stark Heavy-Duty spring-loaded gate casters adjust with surrounding terrain to maintain gate height throughout the opening and closing cycles. These rotating supports work equally well on level and uneven exterior surfaces such as asphalt, brick, concrete, dirt, grass, gravel and pavers. Spring-loaded vertical travel to smoothly navigate the terrain surrounding the gate. Rotating supports work equally well on level and uneven exterior surfaces such as asphalt, brick, concrete, dirt, grass, gravel and pavers Heavy-duty universal mounting plate with 6 holes to easily attach to wooden gates or along horizontal or vertical rails of a tubular farm gate Heavy-duty gate wheel swivel caster is made of premium rubber material and steel construction, sturdy and durable Versatile hole pattern also allows for easy mounting to a tubular farm gate along horizontal or vertical gate rails Spring-loaded suspension to absorb shock over uneven surfaces Color: Silver # of Wheel: 1 Tire Material: Flat-Free Swivel: Yes Frame Material: Steel Max Weight Capacity: 200lbs Tire Size: 8 x 2 Hub Size: 4-3/4" Wheel Size: 8" Diameter Overall Dimension: 8"(L) x 4"(W) x 19-1/4"(H) Mount Hardware Included: No