those bolts are made in china along with the shantys all hardware is complete crap . clam will be changing back to making these in the usa right in the original place in plymouth mn. give them a call number is on clamcorp website and send email with the above photo of the hardware. they should have no problem reimbursing you or replacing the hardware. give it a try and see where it goes,the owner dave osborne has been doing alot to make things right again and as always he wants everyone that purchases his products to be happy with it.