Microperforation is usually required by clients when the form is going to be held by a clip or in a binder and one of the copies has to be kept for records purposes in the right order.
Microperforation makes it easy to tear away one of the sheets while keeping a copy in a secure place.
The microperforation is done on the 8.5x11" sheets. If you choose 8.5"x11.5", those sheets do already have a perforation as part of the size.
The same happens with 9"x11" size
When you order us to drill holes, we will space them addequately so that they fit a regular 3-ring binder.