About this item SET OF 8 DOOR PULLEYS: Our set includes 8 shower door pulleys (4 upper and 4 lower twin rollers) and a squeegee for cleaning; The wheels have a diameter of 23mm; They're designed to fit glass with a thickness of 4-6mm and weigh 42-45g RELIABLE MATERIALS: Our runners are made from a durable zinc alloy with strong chrome plating; The wheels are made from heavy-duty plastic; All of the materials are reliable corrosion-resistant and rustproof meaning they won't easily break/decay QUICK INSTALLATION: These shower door wheels are quick and easy to install; The bottom rollers have a spring-loaded button on top to differentiate them; Once installed our rollers allow your glass shower door to slide effortlessly CONVENIENT REPLACEMENT: Our DIY replacement wheels are conveniently suitable for most shower enclosures steam cabins bathtubs or massage cabins; They'll allow you to easily open/close your sliding doors without effort lasting a long time MONEY BACK : All our shower door wheel runners that are sold come with a 100% money back just in case you are not happy with your purchase; If that is the case please get in contact with us and we will refund you