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KNIFE SWITCH
Knife switches were more commonly used in electrical panels in prior years and are electrical switches that open or close a circuit when one or more of the blades come into contact with one or more clips as the switch is manually raised or lowered to activate contact.

KNIFE WIDTH
With planers and jointers, knife width refers to the number and width of knives that in turn determine the maximum size of materials that can be worked.

KNOB AND TUBE WIRING
Formerly used type of house wiring where conductors are strung between porcelain knobs and porcelain tube are used to line the holes in the structural pieces where the wires pass.

KNOCK-DOWN TEXTURE
Texture used on drywall, which is created by spraying coarse, randomly placed drops of texturing compound then using a trowel to flatten them.

KNOCKED DOWN
Unassembled; refers to construction units requiring assembly after being delivered to the job.

KNOCKING OUT
The temporary removal of a plant from its pot in order to check the condition of the root ball.

KNOCKOUT
Removable metal discs in the sides of an electrical box which can be "knocked out" so that wiring can be run through them.

KNOCKOUT PLUG
Plug used to close the knockout holes that are no longer need in an electrical box.

KNOT
Hard section of a tree where a branch would grow out, which runs through a piece of wood, often loosening and coming out of the board, leaving a hole.

KNOT HOLE
Dent or hole in a piece of wood where a knot comes out.

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