Open-End Nut is a nut that is designed with one or two openings, rather than a completely closed ring structure. This allows it to be easily slid into and tightened onto a bolt or threaded rod without having to slide it over one end of the bolt. They are often used in situations where quick installation or removal is required, as they are easier to apply than traditional closed-end nuts. They are also commonly used in situations where space is limited or frequent adjustments are required, as they allow the use of tools to operate on both sides of the nut without having to completely unscrew the nut.