Hillman Standa Residential Door Steel Wheel Roller - Garage is the roller designed for most residential sectional garage doors. Featuring seven ball bearings, this steel wheel roller ensures long-lasting durability and smooth operation. The roller measures 1-7/8 inches, with a 4-3/8 inch stem and a 7/16 inch shaft, making it compatible with standard garage door track systems. This steel wheel roller helps guide your garage door efficiently through the track system, providing reliable and quiet performance. The package comes complete with instructions, mounting hardware, and important safety and warning information to ensure proper installation. Please note, incorrect installation or door positioning can cause serious injury or death, so follow the enclosed guidelines carefully.