The Grandwork Hammer Hanging Jig mounts on top of a Squaring Platform to provide references that make hammer hanging fast, accurate, and easy. The back side of the Squaring Platform's shank support rail serves as tail guide. And in the high treble, where the shoulder guide left in position would not allow shanks to clear, the shoulder guide can slide out of the way and back again against stops.  We recommend a Hammer Square Lite as a useful accessory to keep hammers vertical as you hang them.