We R Memory Envelope Punch Board helps you quickly make envelopes. Just follow the easy to read chart for sizes from 2 x 3 1/2 to 6 x 8 1/2 inch, 66 different sizes in total. It's just a matter of punching and scoring. Punch portion creates both the fold tabs and rounds corners. Board measures about 10 1/2 x 7 1/4 inch and comes with a bone folder that slides into the side with not in use.