6" x 2" Rubber on Nylon Wheel Heavy Duty Spring Gate Caster6" x 2" Rubber on Nylon Wheel Heavy Duty Spring Gate Caster Rust free and suitable for wash down, high humidity, and outdoor environments. The nylon core is designed to increase load and impact capacities while the rubber tread offers shock absorbing cushioned ride allowing it to roll over debris easily and quietly without damaging floor surfaces. Recommended for heavy duty gates, use 6" caster when the space between the ground to the gate is 7 1 2"