Kickplate: Installed in one or both sides of a door’s bottom rail, polished metal plate is used to protects doors from scratches, dent and soiling of the wood surface.

Krypton gas: Is a gas used in double pane windows, rare atmospheric gas which is odorless, colorless, tasteless, nontoxic, monatomic and chemically inert. Better insulator than even argon gas.

Knocked down (KD): Unassembled window or door unit.

Keyed Cylinder Lock: A lock providing an exterior entry and locking convenience.