This set includes 4 pairs (8 pieces) of soft-close drawer slides, with 12 screws provided for each slide to meet installation needs. The slides feature an ultra-smooth soft-close function, paired with continuous bearings that ensure quiet, friction-free operation, minimizing noise when opening and closing drawers. Crafted from high-grade cold-rolled steel with an electrolytic zinc plating finish, the drawer slides offer excellent rust resistance for long-term use. Designed with side-mounted steel ball-bearing action, they boast a 100 LB load capacity, providing reliable support for various items stored in drawers. For proper size selection, note that the slides use side installation, and their length should not exceed the cabinet case depth. Face frame cabinets require a rear mounting bracket, while faceless cabinets allow direct side mounting of the slides. To choose the right size, measure the drawer length excluding the frame board; if the measurement is an odd number, select a slide that is 1 in. shorter. The slides feature 3-fold full extension, allowing the entire drawer to be pulled out completely for easy access to all contents and full utilization of drawer space. A plastic buckle on the back of each slide enables easy detachment of the narrowest third track, facilitating convenient removal and cleaning of the drawer. Additionally, the double anti-drop function prevents the drawer from separating from the cabinet accidentally.