So I was digging through the garage today and what to my wondering eyes did appear? A half used roll of 12" flashing. I had seen some plans for making some killing cones out of 16" flashing and thought I would make the calculations for making a similar cone out of 12" flashing. So for all you're curious minds out there, here is the rough dimensions to cut 12 inch flashing to make a killing cone that is an analog of the 16" flashing version. Cut a 30" sheet of flashing. on one edge of the flashing measure 15" to find the midpoint. From your midpoint mark, measure back towards the ends 8.5 inches. Do this from each side of the midpoint mark. Now strike a line from these latest marks to the corners on the opposite side of the flashing. Then use tin snips to cut along these two lings and then roll up and overlap the free ends by 1 inch on the top and bottom. Use clamps to hold the flashing in this position and then drill 4 sets of holes, evenly spaces along the portion where the flashing intersects. Then use rivets to secure the cone together. (You can use bolts as well, but make sure that you put the bolt/rivet through from the inside so that the bird won't get cut when you put him in the cone. After I made them, I grabbed a 6.5 week old Cornish X by the legs and did a test fit. It was perfect! I was a little worried about the cone being too short because I was using 12" flashing instead of 16" flashing. As it was, I had to read down into the cone to get the legs of the bird to pull it out. I think I'd be more apt to cut my arm on the top edge of the cone if I had used the 16" flashing. I don't see needing flashing any wider than 12" with a chicken but perhaps the 16" flashing would be a better dual purpose cone if you are processing turkeys as well. Dan Edit: Ok, I was out making another killing cone today and taking step by step pictures. Tutorial to follow shortly. I did, however, realize that I was using 14" flashing and not the 12" flashing as I previously stated. Sorry for any confusion that might cause but even so, you'll see when I post the tutorial that 12" flashing will be more than adequate. In fact, I wish I had found 12" flashing but I wasn't going to buy some when I already had the 14" on hand.