1)Twin Wire Ring 2)Size:1/4" 5/16" 7/16" 1/2" ... 3)Pass SGS 4)Permanently binds document and Durable Twin Wire Binding Cut Lengths1)Most durable method of binding.2)Opens ... colors: black, white, blue, green, red, silver, gray and creamTwin Wire Spools1) Most durable method binding.2) Available in diameters 1 ...