Martin Yale EP323 Master Electric Duo 2 or 3 Hole Punch; Punches Up To 15 Sheets of 20 Pound Bond Paper at a Time, Large Capacity Paper Chip Pan Automatic hole punch up to 12 sheets at a time 3000 punch battery life Same machine will punch 2- or 3-holes No adjustments needed between 2- or 3-hole application Fits into today's office environment