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) threadsβ¦