About Us HAKZEON is a professional manufacturer of garage door rollers and a series of other products. We will do our best to provide you with premium products at reasonable prices. All we do is to bring convenience to your life and let you enjoy a better life. Why Choosing Us? We recommend that you replace all the garage door rollers at once to achieve the best results. The garage door rollers are made of reinforced nylon and 6200ZZ precision ball bearings, which are strong and durable, more stable and quieter than other rollers. The 6200ZZ garage door roller is the best choice for quiet operation and prolonging the service life of the garage door. Don't miss them! The nylon garage door rollers can reduce noise, reduce friction, and ensure that the garage door opens and closes stably and smoothly. The diameter of the garage door rollers is (1-13/16 inch) 46 mm and the thickness is 1/2 inch (12 mm). The stem diameter is 0.43 Inch (11 mm) and the length is 4 inches. Product Specifications Material: Nylon Diameter of Roller : 1.81 Inches (46 mm) Thickness of Roller : 1/2 Inch (12 mm) Diameter of Stem : 0.43 Inch (11 mm) Total Length : 4.72 Inches (120 mm) Packing Includes 20 x Garage Door Rollers