Those rollers are affixed to the and bottom of shower doors in order to provide smooth running when you open and close your shower doors, can move the bathtub anytime to anywhere that you wantPerfect for most shower enclosures, shower cabins, steam cabin enclosures and bathtubFeature- Color: As shown- Material: plastic and metal- Package Size: 20 x 20 x 10cm- Wheel Diameter: 25mm- Sturdy and secure construction- The rollers are affixed to the and bottom of shower doors in order to provide smooth running when you open and close your shower doors, can move the bathtub anytime to anywhere that you want- Perfect for most shower enclosures, shower cabins, steam cabin enclosures and bathtub- Diameter of the wheel: 25mm- Easy to install and use, and won"t damage your glass doorPacking list8 x Shower Door Wheels Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.