They are #10 x 32 x 3/4" screws with washers.  They were a better price than others out there, and for some reason I could not find anything that had the "right size head" at my local hardware store.  I use them in a SKB 8u roto-shockmount box.  That PA setup travels around and bounces here and there, so far I have not had to tighten anything up, yet.  As a musician they won't make you play or sound better but they will hold your equipment in place, and after all thats all they are supposed to do!