I cant seem to figure out why the products start a configuration of 4 x1 x4 x1. http://hollandbarstool.com/product-categories/metal-series-34.html
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It looks like you have a responsive CSS issue on your hands.
Your product rows are 5 across, so 100% / 5 = 20%
Each of your products have a width of 18% + a margin of 2% + a padding of 2% + border of 1px = 22% +1px
This is what happens if you take the padding off and reduce the width to 17%:
17% + a margin of 2% + border of 1px = 19% +1px
I hope my explanation makes sense and helps you come up with the best option for your site!