Outwater's complete 4 ft. long sliding door track set comes with 1 upper track and 1 lower track. It is designed for 3/4" thick glass or wood panels. Popular applications include showcases, display cabinets, and custom reptile cages. Is your space shorter than 3 feet? No problem, the channel can be trimmed with a hacksaw for a custom fit. Outwater's sliding door track is made of high-quality aluminum with great strength and some corrosion resistance. It features a dull mill finish which may or may not have die lines (natural scratches).