Square head bolts. About 1/4" x 1 1/2" (IIRC--measure thru the table
edge to be sure). The head of the bolt slips into the channel at the
back of the rails, then thru the holes in the edge of the table and any
extensions. I don't remember washers, but they wouldn't be a bad idea.

Pretty quick to mount. If this doesn't make sense you could probably
find a PDF at the Sears/Craftsman website. Otherwise, ping me and I'll
try to find my manual and send you a copy.

I've been very pleased with this fence.

Dan