Space saving: make your room look more spacious Suitable for cabinets, etc., smooth and silent operation, no slot ground wire clamped in the middle of the door or at the bottom of the door Socket: Connect the rail and the cabinet with screws in the middle Keeper: Installed on both ends of the track to prevent the pulley from moving out of the track Easy to match: It suits your home style, whether it's American Nordic Japanese or Rustic Modern Minimalist Material:Carbon steel colour:Black Package Contents: 2 x pulleys 2 sets x anti-jump sheets 2 groups x anti-blocking 4 sets x screws (as shown) 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.