A Two Leg Armature Bearing Puller is an indispensable tool for removing bearings seized to drive shafts and the like. It has an operating range of approximately 35mm width and 45mm length and while it won't deal with every job I've found it to be the most useful size of puller in my toolbox.
The puller is simple to use and is adjustable and lockable for width using the two socket head screws and the mandrill has a heat treated point. where you have minimal purchase I often find it better to lock it for width with a small G clamp as you can get a better purchase on the work. When used correctly a puller will make quick work of some seemingly impossible jobs.