Specifications: Fully adjustable rollers ensure smooth and safe sliding. It can be used with 3inch thickness doors, and it is suitable for all brands of barn door. You can fix 2 screws on the floor base plate, adjust and tighten, then the product installation will be finished. Built-in bearing provides ultra-smooth rolling, which is convenient to use. Type: Floor Guide Material: Carbon steel Feature: Carbon Steel, Easy to Installation, Durable Size: 10.5cm x 4cm x 5cm/4.13" x 1.57" x 1.97" (Approx.) Notes: Floor Guide Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Floor Guide 2 x Screws 2 x Anti-skid Belts 1 x Wrench