A recoiler is a heavy-duty mechanical assembly located at the exit end of a processing line such as a slitter or a hot strip mill. Its primary function is to provide the necessary tension to wind the finished metal strip back into a tight, uniform coil. Proper tension control is vital; if the recoiler pulls too hard, it can cause "telescoping" or even reduce the strip's gauge through unintended elongation. In a slitting line, the recoiler must simultaneously wind multiple mults of varying widths, requiring a sophisticated tension-leveling system.