These 5/16" Silver GBC WireBind Spools have 62500 loops of wire in 3:1 Pitch. They are designed for easy use with spool-compatible wire binding machines including the STL1000.
This particular spool contains 5/16" Silver wire, and we have all the other sizes and colors available of GBC wire spools.
Bind books up to any length you need, and up to 60 Sheets (20# paper) thick.