The Wondrous 1-2-3 Block
...world of machinists. One such tool is the 1-2-3 block that I’ve found many uses for in woodworking. These blocks of metal, sold in pairs, are named after their dimensions, one inch by two inches by three inches (they also come in larger sizes such as 2-4-6). Mine have both threaded and un-threaded holes allowing you to attach and pass through bolts. You can bolt them together square or at an angle. They have a million applications: To see if a too...