Features: OOTDTY The are made from nylon with stable load bearing capacity. Good equipment and for home lavatory use. The pulley could be adjusted. Use a screwdriver to expose the screw clockwise or counterclockwise to shorten or delay the glass sizes. It is suitable to use in bathe room, partition sliding door, sliding door. When you slide the door, there isn't any noise and slide smoothly. Easy to install and maintenance. Specifications: Material: nylon Wheel diameter: 23mm (0)/25mm (0) Package Includes: 1x Pulley Note: Please enable 1-2cm errors thanks to instruction manual measurement, make sure that you do not intellect earlier than you order. Due to the variation between assorted monitors, the picture won't replicate the particular colour of the item.