All of our products comply with strict quality control and advanced technology makes CCJH Sliding Barn Door Hardware more reliable. Material:Steel. Color: Frosted Black. Maximum Door Weight Capacity: 250lbs. Door Thickness: From 1 1/4”-1 7/8”(30mm-50mm). The top of the Doors to the ceiling : Min distance is 6.7 (17cm). Suitable for the bedroom, study room, living room, kitchen etc. Item: 4-16FT sliding barn door hardware. (Hardware only, door is not included). Color: Frosted Black. Maximum Door Weight Capacity: 250lbs. Wheel Diameter: About 5.9. Door Thickness: From 1.18″ To 1.96″ (30mm-50mm). The top of the Doors to the ceiling : Min distance is 8-7/10. Suitable for the bedroom, study room, living room, kitchen etc. How to Choose Track Lenghth. Single Door Min Track Size= 2 × Single Door panel Width (EX: If your door panel width is 3ft, Min track size is 6ft). Double Door Min Track Size= 4 × Single Door panel Width. (EX: If your single door panel width is 3ft, Min track size is 12ft). Ackage includes: For Single Door. According to rail holes. 1 hole need 1 set. Roller Bolt: x4. Door Stopper: x2. T-shape Floor Guide: x1. Install Manual: x1. Ackage includes: For Double Door. Roller Bolt: x8. Door Stopper: x4. T-shape Floor Guide: x2.