For the strongest binding post option, choose steel Chicago screws. The zinc coated steel is incredibly durable, ideal for those working in the field. This makes them the premier solution for engineers and construction companies. Steel binding posts come in sizes from 1/4 inch to 2 inches and are easy to unbind and edit as often as you need to. They are threaded all the way through, making them not only made from the strongest material, but also creating the strongest bind. The natural silver color is professional and classic, and the rounded tops feature slotting so you can use flathead or philips head screwdrivers, if you choose—though they are easy to bind and unbind by hand. These metal book binding screws are also sized to work perfectly with standard hole sizes about 5/16", so they work well with any traditional hole puncher.
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