The Design House 728295 Entry Knob accepts a key on one side of the lock and is operated by a turn-button knob on the other side. Finished in polished brass and designed for left or right-hand doors, this knob fits the two most common backsets in the U.S. (2-3/4 inches and 2-3/8 inches). Entry knobs are often used on front doors and back doors. Use this knob on standard 1-3/8 inches and 1-3/4 inches thick doors with a cross bore 2-1/8 inches in diameter or an edge bore 1-1/16 inches in diameter. (1 inch x 2-1/4 inches radius corner faceplate). This unit features anti-bump pins as an added security measure to keep your door securely shut when locked. This product is ANSI Grade-3 certified and rated for residential security. KW1 Keyway with entry lock KA3 - 3 keyed alike per cut case.