This Sulawskys drawer slide set includes 6 pairs drawer slides, with 12 screws included per pair. Designed with a 3-fold full-extension structure, the drawers can fully extend, allowing easy access to contents without reaching deep into the cabinet. The steel ball-bearing system ensures smooth and quiet operation, creating a silent living environment for your family. For size selection (side-mounted installation), measure the drawer length without the frame board. If the length is not an even number, choose a slide 1 in. shorter, and ensure the slide length does not exceed the cabinet depth. Face-frame cabinets require rear mounting brackets, while frameless cabinets allow direct side mounting. Crafted from high-grade cold-rolled steel with an electro-galvanized finish, these slides are rust-resistant for lifetime use. The side-mounted steel ball-bearing design supports a 100 LB load capacity. They suit drawers of varying depths in kitchens, bathrooms, bedrooms, and offices. They also work for keyboard drawers, wardrobe drawers, wooden/steel cabinets, toolbox drawers, and other high-load applications. A plastic buckle on the back of the slide rail allows easy detachment of the 3rd track (narrowest section) for cleaning. The double anti-drop function prevents drawers from separating from the cabinet. The 3-fold full extension enables complete drawer pull-out, maximizing internal space utilization.