1.SPRING LOADED DESIGN The gate wheel features a spring loaded mechanism that allows it to automatically adjust the height over uneven ground, preventing a gate sag while ensuring smooth movement for your driveway gate. Ideal for wooden doors and metal gates 2.Heavy duty caster wheel: with a maximum load capacity of 110 pounds, this 4inch goal wheel is suitable for high performance gates. It has been built for difficult conditions and is suitable for fence for gates. This makes it reliable for wooden fences and farm gates 3.EASY MOVEMENT SHOCK ABSORPTION The wizards are designed to absorb shock and deliver a smooth rolling action. Whether it's a driveway gate or a fence gate wheel, you'll appreciate how easy it is to open and close the gate with minimal effort for any look 4.Premium materials: this highperformance gate wheel is made of premium nylon and metal and great durability and strength. Nylon gate wheel resists wear and tear and is a long lasting solution for your wooden gates and fence gates