Heavy Structure: Made of Roll-formed galvanized steel with 5 track brackets, which can hold up to 450lbs door. 50000 cycles and corrosion resistance test passed, sturdy and durable. Can be used for both interior door and outside door (for single door use, door NOT include).Corrosion-resistant: Galvanized coating process is adopted on the surface to prevent corrosion. It can withstand the harsh outdoor environment and ensure long metallic luster and service life.Sliding Smoothly: Precision formed steel hangers with double axis track, offer minimum friction and smooth operation. Track end caps decrease potential damage from hash weather.Easy to Install: The kit contains all the accessories required for installation, which can be quickly installed step by step according to our instructions.Package Included: Splice Track, 2 × Track end caps, 5 × Track brackets, 2 × Hangers with door strap,1 × Galvanized steel floor guide, 2 x Stoppers & Step-by-step instructions. Suitable for door thickness: 1-3/8" to 1-3/4". Maximum door width: 36".Guarantee: 5-year quality warranty. We are reliable and qualified manufacture. Professional customer service team help you solve problems in time.