| This is the new Hinge Doctor HA4D tool. It works like the normal Hinge Doctor, or you can use it with an adjustable wrench. Great for when you have close fitting trim that doesn't allow you to use the normal way. These are for the largest types of hinges, used on Institutional doors, Prisons and some larger spring hinges. Knuckle width .9".
For extra large spring hinges, check out the new HA7 tool