Garage door hinges are made of steel,zinc plated finish,nylon shells and steel wheels with zinc plated finish ,durable and sturdiness,high quality can be used for a long time The garage kit comes with adjustable top roller brackets and premium quality quiet 2 in nylon rollersand can reduce door noise byup to 75%,high quality parts to ensure smooth, lasting door operation Garage door hinge roller tune up kit is designed for an couple 16" wide x 7" high or a 18" wide x 7" high garage door.It's great for any door and would be perfect to quiet down your noisy door Accessories: Includes 5 pcs Number 1 Garage Door Hinge, 11pcs 2 in white nylon rollers, 2 pcs A-type pulley brackets, 2 pcs Number 2 Garage Door Hinge, 2 pcs Number 3 Garage Door Hinge; 48pcs carriage screws and hex nuts Easy installation: The garage door hinge and roller adjustment kit can be installed according to the installation instructions, which is easy and quick to install If the hinges are not enough, you can find a separate hinge on the product details page