High Quality: High quality POM plastic. Adapts to different types of showers. Ensures your doors glide more comfortably No decompression and no wasted money: Did you buy a sliding system and it's broken? You think with horror that now you have to buy a new one. Forget There are replacement shower door rollers that will fit any sliding system in your home. If you're having trouble sliding shower doors, use this quick fix and don't waste your money Use anywhere: shower door slides for showers, massage cubicles, bathtubs, hot tubs and even for furniture accessories. Make sure the door or doors open easily and smoothly. Replace your broken system. Premium Shower Rollers Rolling Component: Smooth rolling of the door with a slight effortless forward or backward movement for shower enclosures, hydromassage boxes clearly perform the task assigned to them, distributes the mass of the glass, controls the movement in the given direction. This gives the product even more durability and a longer life Roller diameter: 25mm. Interior: 5 mm and thickness: 5.5mm. With M4 20mm length Suitable for most shower enclosures, shower enclosures and sauna cabins. Please Note: We only have this one size screw as this link. If you need different sizes of screws, you need to buy it yourself. Pack of 8 small multi-function rollers with screws. Suitable for most shower enclosures , shower cabins and sauna cabins. Materials: plastic, nylon, 304 stainless steel, POM ABS micro-bearings, brass axle. Roller diameter: 25mm. Interior: 5 mm and thickness: 5.5mm. With M4 20mm length. Wheels: approx. 25mm diameter x 5.5mm thickDelivery quantity: 8 pieces Product color: white Product size: 25*5mm