After posting with jlockhart29 on build a raised grid for the medium (thanks JL) I went out and bought the extra grid. However, I've read several post on the concern for different hardware types, e.g., zinc, galvinized and stainless steel.
Right now I'm holding out for stainless steel - need to get to my turn of the century hardware store for SS as the local Home Depot didn't carry the right sizes.
What are type of bolts, washers and nuts are you using on yours? And is there a strong recommmendation for any particular type of steel?