They did not come from Brownells so and I don't know whether they make them (oct blocks) or not. I make all my own out of a good hardwood that has the grain going parallel to the split between the blocks. I think mine are apple wood. The oct blocks were just laying around. I drill a hole in the block the diameter I want and then saw the block in half. If you want to "oct" a round hole, just use a wood chisel. Round would work fine and should really bite into the octagon (actually the other way around). All the tools were made but Brownells type (saw similar in Midway) vise is a good buy if you don't have the machinery and materials to make your own. I made my "mauser" wrench but I bought my "rem 700" wrench. Just whichever you have more of; time or money; works either way. The wrench is just a thick, long piece of metal with another shorter piece of metal and holes drilled through the shorter piece and matching threaded holes in the longer piece. Put brass plate between the wrench and the action, top and bottom, to keep from marring it, tighten down the bolts evenly, and smack the end with a hammer.