1. The Wire-O hole punch is a 3:1 (3 to 1), which means every inch there will be 3 holes.
2. The punched hole will be a square shape of 0.1875" (4.572mm). 
3. The spacing between each hole is also the same 0.1875" (4.572mm)
4. The distance from the edge of the sheet to the furthest edge of the hole is 0.27" (6.858mm)
5. The distance from the edge of the hole closest to the edge of the sheet is 0.09" (2.286mm)

See the image and figure below.

Is there a possibility of making a waterproof book?

Yes, we can print waterproof books using synthetic paper.

Can you do a non-standard size for the coil-bound books? 

Yes, we can accommodate custom sizes. For this, you need to choose the next larger size on the product page. After you submit your file you will receive a confirmation email. Reply back to that email with your new custom size required for printing.