Square Rosette: Starpy maintains modern square rosette with Column knobs to be contemporary interior door knobs,one piece knob is perfect hand touch. Privacy Function:These privacy door knobs use on the bedroom or bathroom doors,locked by turn button from inside,outside can be unlocked by tool if someone emergency inside. Standard Door Thick: Fits most of size doors 1-3/8" to 1-3/4" thickness, latch backset adjusts to either 2-3/8" or 2-3/4",you can remove the middle black part to adjust,with black part means 2-3/8"only. Fast Installation: The simple installation of Starpy door knobs,just use screwdriver in 15 minutes,reversible for left or right handed,clarify the opening direction before latch installation. Quality Warranty: Starpy offers you a premium quality door knobs for 3 years warranty usage. Classic Pismo door knobs are made by Starpy Hardware, as a premium door knob expert, having multiple colors choices for your Interior doors.