These Dampening Butt Hinges consist of two rectangular leaves with a Teflon coated pin that produces a very precise, low friction movement for a very high end feel with anti-rattle properties. Designed to attach to abutting surfaces of a door and door jamb or to be mortised for a flush installation. Constructed of corrosion resistant stamped 304 stainless steel. Installs with four #8 FH fasteners (not included). Patent Pending.