Coil Binders — Punching for Plastic Coil

The solution was to make the die an oval die. Not your grandfather's oval die, but a new, oversized oval die 11⁄64˝ (4.365mm) wide and 7⁄32˝ (5.5mm) high. This allowed for a bigger hole without causing to punch too close to the edge of the sheet. It also forced customers to purchase brand new dies for their punching machines with this pitch.