Axle U-bolts

Is there a difference in axle U-bolts? I understand that the material that the bolt is made from would make a difference, but other than that? I found some on Ebay that are listed for trailers would these work? The length and diameter is correct, and the price seems right, but I just don't want any problems.... Here's the listing of the item on Ebay. eBay item number: 291322798673 And they are only $14.95 shipped....
Thanks,
Chris
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