Diamond Calk and Horseshoe, you're kidding right? The famous company of Diamond/Diamalloy tools, Duluth Minnesota? Makers of the famous diamond shaped calks that screw into your horses shoes for positive traction in ice and snow and frozen mud. And the wrench to install and disinstall them. Famous all over some places. Am working on a set of their adjustable wrenches in bare steel. I have, let's see, probably six or eight, maybe more, from six inch to 24 inch, jaws approaching 3/4 of an inch in thickness, also makes a great defensive weapon! I have pics,