Made of high quality material, and practical to use & STURDY - High strength industrial grade tracks and pulleys can easily hold 100 lbs loads; Great for doors 1/2 inch and 1-1/8 inch thickness. material and excellent forging process provide a safe and guaranteed life . strong and sturdy: Save space: make your room look more spacious Suitable for cabinets, etc. Easy to match: suitable for your home style Material:Carbon steel + POM colour:black Package Contents: 2 * Roller 2 * End Caps 2 * Floor Guide 4 * Screws with nuts Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.