Hopewell Precision Inc. offers in all of it's Mesh Vented Doors the max venting you can get without using Chicken Wire..........This is a 16GA ,060 Steel , Class 2 Temper Material.....The hex is a .450' on a .500' staggered pattern............81% open............Can small fingers or pencils be put through the opening? Yes....so when Security or Safety is an issue , we still offer all the smaller Perforated Materials ...........We offer everything except Chicken Wire.