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Jack stud

A Jack stud is a partial-length stud that serves as a stilt or brace underneath each end of a header. Installed in pairs and fastened to the king studs, these define the left and right inside dimensions of the rough opening. Also referred to as a trimmer stud

Jig saw

A jig saw is avariable speed handheld saw with a flat base is used to cut curves out of material using a small straight reciprocating blade

Junction box

A junction box is a plastic or metal enclosure that houses outlets, switches, wire ends, and connections for user and fire safety purposes