The main block is 1"x1.25" tall and 3.5" long. The top piece is 1/4"x1" bar 3.5" long. The rods are 3/8 and 2" on center. I'm making a small batch of these right now (since, of course, all of my rifles need one:)) that are a little different, but very similar. I'll get a couple of new pics...