The Tamerica DuraWire 450 manual Wire Closer is a heavy duty manual wire closer designed to close twin loop wire binding spines up to 14" in length. The rugged steel construction of the DuraWire 450 makes it perfect for high volume applications and it competitive price makes it a natural choice for most users. This heavy duty manual wire closer is designed to close both 3:1 and 2:1 pitch wire (it also works great with 19 loop wire). Use this along with your wire punch to increase speed and efficiency when assembling your books.