What is the official description of the Handi-grip bolt size? I have a hex wrench that can fit into the socket head about 1 / 16 th of an inch, not 1/8 inch or 5/32 inch, the depth of the socket, and it goes in very snug. I have to use it though because it is the ONLY wrench that will fit at all. I've used all of my metric and SAE sizes and even some oddballs that measure odd dimensions with no luck. Ken