Superior material and quality than the most available online at similar pricing.

Black powder coated, 6.6 feet rail, pre-drilled holes 16" apart, Anti-Jump system. Supports 200 pounds comfortably, fits door 36" wide, 1 3/8" to 1 3/4" thick. 

Included 6.6 ft Rail, 5 Spacer, 2 Roller, 2 Door Stop, 1 Floor Guide, 2 Anti-Jump Discs (all hardware in picture). 

POM nylon wheel, smooth, durable and quiet.