Outwater Plastics' plastic sliding door track features an upper track, and lower track. It is designed for installing by-passing 1/2" thick sliding doors with a 9/16” gap. Popular applications include replacement sliding door track, sliding showcase doors, bookcases, small cabinets, vanities, medicine cabinets reptile tanks, vivariums, honeycomb panels and more. Our sliding door track system allows wood doors to slide smoothly and quietly without requiring glides, wheel or lubricant. Installation is fast and easy. Simply apply screws, glue or double-sided tape. Our upper/lower sliding door track is manufactured from durable Styrene that can withstand years of use. It features a solid white finish. Upper Track Dimensions: 1-3/8" W x 11/16" H x 48" L. Lower Track Dimensions: 1-9/32" W x 11/32" H x 48" L.