Double Loop wire comes in 3:1 pitch (32 loops/11″) and 2:1 pitch (21 loops/11″)
and uses either square or round hole punching dies.

Sheet Capacity	Thickness to be bound	Diameter — Pitch	Quantity per box
60	1/4″	5/16″ — 3:1	100
75	5/16″	3/8″ — 3:1	100
90	3/8″	7/16″ — 3:1	100
105	7/16″	1/2″ — 3:1	100
120	1/2″	9/16″ — 3:1	100
135	9/16″	5/8″ — 2:1	50
160	5/8″	3/4″ — 2:1	50
190	3/4″	7/8″ — 2:1	50