DURABLE MATERIAL: The glass door roller wheels are made of nylon, which is smooth and flat, sliding without noise, and not easy to break or deform. The screws are made of stainless steel, strong and stable, not easy to fall off, you can use them with confidence. EASY TO ADJUST: The bathroom glass door rollers can be adjusted up and down so that the door can be aligned so that it fits the frame, perfect for replacing old or broken shower door rollers. WIDELY USED: The glass door rollers are suitable for shower door slides in most shower enclosures, shower and steam rooms, and even furniture accessories. SET FEATURES: Glass door roller. One set contains 8 replacement shower door rollers. We have wheels with a diameter of 23 mm, you can choose the wheels that suit you according to your needs.