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Looking at their website it looks like they now have them up to 1/2 inch they used to only go to a 1/4 inch . But with Tapcons you have to use the correct size drill bit ( they come with the boxes of 100 ) or they won't tighten down right . They are good at holding thingsto concrete but snap...

Tapcons don't make them that big . Expanding anchors would be best suited for that , but it could just be the photo but it looks like the holes are angled and removal at a later date could be a issue . These would be a good choice http://www.confast.com/products/double-anchor.aspx