5/16" and 11/32" ASE fasteners are commonly used in American appliances, heaters, etc. Often the panels and assemblies that use these fasteners are solid and rigid. to get into the areas. Ordinary wrenches and sockets may not reach and rotate some fasteners. I used this tool to disassemble, repair and reassemble a water heater vent. This vent was hung on the wall and almost all of the fasteners required this thin wrench, turning the fasteners a few degrees at a time.