Ugh, sticking or noisy sliding mirror doors are the worst, right? Well, this 4-pack of replacement rollers will fix that problem in no time! These are the exact same type that contractors and door manufacturers use, so you know they're good quality. The wheels are made from durable nylon with a narrow concave edge that gives you a super smooth, quiet roll - no more annoying grinding sounds every time you open the closet. The coolest feature is the top adjustment screw that lets you easily raise or lower the door with just a Phillips head screwdriver once everything's installed. There's even a set nut to keep things from loosening over time. The housing has a 1-7/8 inch width with 2-1/2 inch hole centers, and there's a separate metal bracket that slides into your existing roller housing in most cases. We're including four rollers because you'll want to replace both rollers for two-panel doors at the same time - trust me, it just makes sense to do them all while you're at it. Just a quick note - bolts aren't included, so hang onto your existing ones since you definitely don't want to risk breaking your mirrors with the wrong size. Installation is pretty straightforward, and you'll be amazed at how much better your doors slide afterward. No more wrestling with stuck doors or listening to that awful scraping noise. Your closet doors will feel like new again, gliding smoothly and quietly like they're supposed to. Such an easy fix that makes a huge difference in your daily routine!