GBC Spool Wire 3:1 Pitch GBC Spool Wire GBC Spool Wire is made of high quality wire binding material and is designed to run in all automatic spool wire binding machines. GBC Double Loop Ring Wire is very high quality. Less expensive spool wire can cause all sorts of problems with your automated equipment. GBC Wire Spools will help reduce problems with stretching that can occur with cheaper import wires. There is 3:1 and 2:1 pitch wire to choose from. 3:1 diameter choices are 1/4″ through 9/16″. 3:1 pitch spools are usually used for book thicknesses from 1/8″ to 1/2″. Standard Colors: Black, White and Silver ¼” 45 page capacity, 84,000 Loops/Spool – $138 5/16” 60 page capacity, 60,000 Loops/Spool – $129 3/8” 75 page capacity, 43,000 Loops/Spool – $112 7/16” 90 page capacity, 31,000 Loops/Spool – $110 1/2” 105 page capacity, 24,000 Loops/Spool – $101 9/16” 120 page capacity, 21,500 Loops/Spool – $99 Order Here