Coil Binders — Punching for Plastic Coil

This led to another problem: 44 round 11⁄64˝ holes will not fit attractively on an 11˝ (or A4) sheet. It will leave you with a razor thin margin, totally unacceptable to the customer.

What many manufacturers did was devise a new die pattern—the .2475˝ pitch die. This means one hole for each .2475˝. But the problem was that the hole was still too small to accommodate many automated coil binders. If the hole was made any bigger, it would punch a partial hole off the edge of the sheet.