Package content: 2 pairs of door guides with 8 screws. Material and size: plastic material. Size: 45 x 20 x 23mm. Prevents the sliding door from coming off the wall. No thickness limit: This is a fully adjustable floor track that can be used for any door thickness. Can be used for most barn doors. Easy to use: Hooks in the center of the door or with doors that have a slot at the bottom. There is no need for slot on the door, very convenient and labor-saving. Adjustable Design: Your barn door will experience a very smooth sliding on our floor guides, and no noise will affect your life.