High Quality Materials: Made Of High Quality Hard Plastic For Long Life. It Has Good Impact Resistance And Does Not Rust. This Is A Fully Adjustable Floor Track That Can Be Used For All Door Thicknesses. Easy To Install: Adjust The Distance According To The Thickness Of The Door Freely And Tighten The Screws To Fix It. Easy To Do It Yourself Without Tools. CompatibilityAdjustable Sliding Door Rollers Are Suitable For Door Panels From 30Mm To 60Mm, And The Adjustable Design Makes It Comfortable And Fast For You. Easy Sliding : Smooth Bearings Can Slide Easily, Then The Door Slides Easily. The Bottom Of The Floor Guide Is Flat, Does Not Damage The Door, And The Floor Can Slide Smoothly And Quietly Simple And Beautiful Style: No Need To Drill Holes In The Wall, No Damage. The Floor Guide Is Installed In A Delicate And Light Shape On The Floor. The Design Is Very Simple And Beautiful.