This equipment is included in the category of hand tools (Hand Tools). Washers are designed to remove and tighten bolt heads by providing greater additional torque.
This is because the arm of the tool is longer, so it can be more optimal for tightening.
For double ring locks, you can use it on circular and hexagonal bolt heads.
This tool is suitable for use when you want to work in a narrow and limited space, because the walls of the ring are quite thin.
Ring locks can cover all the outside of the bolts and nuts to be installed or opened.
This is certainly an advantage in itself, because it can minimize the occurrence of damage. This tool can also reach sunken places because it is designed with a curved shape.