Metal wire-O,32 Loops,Black/White

Wire Binding gives your documents a well polished look while keeping pages in perfect register. These spines are black and white in color.

This tamper-proof binding system also lets your books open a full 360 degrees and will allowing your document to lay flat when opened. 3:1 pitch refers to 3 holes per 1 inch and will be based on your punching machine die.