... lays completely flat open or closed. Permanently binds document Twin Wire Binding Cut Lengths• Most durable method of binding.• Opens ... , white, blue, green, red, silver, gray and cream Twin Wire Spools• Most durable method binding.• Available in diameters 1/4" through ... pitch• Available in colors of black, white, and silverTwin Wire BindingSpecifications Twin Wire 3:1 Pitch (fits 3 holes per inch)