Track Kit Sliding Door Max Weight (Lb.) 250 lb Aluminum Silver Brushed Aluminum Finish Shaft Length 7/8 in Length (In.) 72 in Height (In.) 1 3/8 in Width (In.) 3 1/2 in Depth (In.) 72 in Inside Dia 3 1/4 in Outside Dia 3 1/2 in Max Wheel Dia (In.) 3/4 in Roller Width/Dia (In.) 3/4 in Top Mounting Mounting Hole Size (In.) 3/8 in Ball Bearings Number of Wheels 8 Aluminum Hardware Included Requires Hardware For Use With By-Pass Sliding Doors