👍QUALITY IS 100% UNDER CONTROL. We picked the most premium carbon steel to make the hardware heavy-duty and sturdier than the competition. The black powdered coating makes the paint stays forever and will not be scratched off. The wheels of the roller are made of high-quality nylon which ensures minimal noise when it glides on the track. Each complete track can hold door weight up to 220 lbs. 😊FULLY OPTIMIZED CONNECTING AND SPACING. I understand how frustrated it was when you opened the box and found out multiple smaller tracks that were hard to line up and connect. Even worse when the spacing was not exactly 16 inches. We’ve got them all figured out!