If you're the type of person who will solve any problem with a wrench, pliers, hammer, tape, or portable drill and take pride in your behavior, then ignore the review. For those who do it right. 18mm screw heads. 11/16 inch nuts. 17mm will fit a nut but not if your wrench or socket is to close tolerances. Size that fits properly on bolt head is 18mm, 3/4" is extremely sloppy and totally useless, 11/16" won't fit at all . The included screws are 4 1/2" (114mm) long with 2 1/2" (64mm) threads. MOUNTING DATA A 4x4 bolt pattern 12" trailer wheel hangs 4" below the lowest point of the main mounting bracket plate. Same as I said, a 12" wheel hangs 4" below the trailer frame it's mounted to. Although the mount is tilted up, the tire itself hangs down. offered on amazon completely hides this detail. (Carefully uses parallax error to deceive) PLEASE NOTE: A 12" hoop hangs 4" below the frame IF. The bracket is mounted at the highest point. A 12" tire can hang 7" below the frame. So at best. 4 cm below the frame. (Obviously the big tire hangs lower). Best idea as others have said. With some corrosion resistant grade 5 or 8 fasteners to match your frame. mm if you prefer metric. Then the fastener will not rust and the size of the bolt head will match the size of the nut as usual and typical. Now the good news. For the price this is a good buy and works great if you are fixing the hardware.
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