DETAILED INSTRCTIONS: Enclosed manual demonstrates every installation step in both words and figures to help you quickly assemble the hardware and fully enjoy the process of DIY. SMOOTH SLIDING: Scientifically designed and good processed sliding tracks connect tightly, ensure smooth and steady rolling every time. EXTRA STRONG: High strength industrial grade tracks and pulleys can easily hold 220 lbs / 100 kg loads; selected material and excellent forging process provide a safe and guaranteed life for your family.