Akiles Coilmac-M41+ Plus 13" Heavy Duty Oval Hole Coil Binding Machine & Punch & EZ Inserting Table 4:1 Pitch The first of its class to offer oval holes making inserting much faster as compared to round holes All 54 pins can be independently pulled & disengaged 13-inch Single Punching Length with open ends & guide to easily punch documents up to 26" Revolutionary 0.248" pitch specifically designed to give 44 evenly-centered holes in an 11" sheet