Store Categories Store Categories US-Sliding Door Accessories US Barn Door Hardware US Home & Garden UK Barn Door Hardware Single Door Double Door Bypass For 2 Doors Bypass For 4 Doors Top Ceiling Hardware Stainless Steel Hardware All Size/Type/Style US- Others US Sporting Goods US Beauty Other 3-9FT Bifold Sliding Barn Door Hardware Kit Black Flat Track Modern for 2/4 Door Product Description [STRONG & STURDY] Made of high-quality steel with premium nylon roller wheel and Gcr15 roller bearing, the surface is black matte, High strength industrial grade tracks and pulleys can easily hold 220lbs loads,anti-corrosion and anti-rust.Maintains its beauty and longevity for many years. [How to choose a size] You can choose the appropriate track based on the width of the door and doorway width [Fits 29-1/2~42-1/8" Doorway Width] Adapt to door thickness: 1-1/5" to 1-3/4",less than 21" Wide.4FT Sliding Door Hardware Kit fits maximum SINGLE Door leaf width:21". The minimum distance from the top of the door to the ceiling