Fluted Crystal Glass & Polished Chrome Passage Door Knob Sets for Modern Doors+includes Our New Secure Set Screw System. Includes hand made wood adapters to fit pre=drilled doors. Complete set-Best set for Do-It-Yourself as is a little labor intense to hot glue the wood adapters The features not be available by marketing firms with similar products Plus info for secure set screws to keep your sets trouble free. All sets are assembled and tested in the USA Guaranteed to your satisfaction, Unconditionally