Hillman Heavy Duty Steel Wheel Roller, Zinc-Plated is an i roller designed for most residential sectional garage doors. This heavy-duty roller features ten ball bearings, ensuring long-lasting performance and smooth operation. The steel wheel roller measures 1-7/8" in diameter, with a 4-3/8" stem and a 7/16" shaft, making it a reliable component to help guide your garage door through the track system effortlessly. The package includes detailed instructions, mounting hardware, and important warning and safety information to assist with proper installation. Please note that incorrect installation or door positioning can cause serious injury or death, so it is essential to follow all provided guidelines carefully.