Made from high-grade cold rolled steel, zinc plated, steel construction ball bearing full extension slides are rated for heavy-duty use(loads up to 100 lbs) Size(folded): 30*4.5*1.2cm(L * W * H), Detailed instructions and mounting hardware included for easy installation (additional brackets needed for face-frame drawer construction) Steel ball-bearing action slides that are ensure smooth and quiet performance, featuring soft-close functionality to close any drawer softly and silently These slides are compatible with most major drawer and cabinet types and are ideal for new construction, remodeling and replacement projects Refund or replacement for quality problem, please feel free to contact us if you have you any question with your order, we will solve it in 24 hours