BATH FUNCTION: These are round and colonial style door knobs, recommend use on the privacy or bathroom doors,locked by turn button from inside,outside can be unlocked by tool if someone emergency inside. MULTI PACK OPTIONAL & EASY INSTALL: This door knobs is simple installation just use screwdriver in 15 minutes,reversible for left or right handed,make sure the opening direction before latch installation. Here are 1,6,8,10 pack optional for you. DOOR THICKNESS STANDARD: Fits most of size doors 1-3/8" to 1-3/4" thick, 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. PERFECT COLORS: NCSEN offer you brushed nickel and matte black colors for the classic home style. All door knobs are made of stainless steel, rust resistance and durable surface. WARRANTY FOR CUSTOMERS: We promise 3-year warranty for mechanical. For brushed nickel finish warranty 5-year and black finish warranty 2-year with great after service. Installation question or quality problem kindly E-mail contact nicsen@foxmail.com. NCSEN Building Hardware has professional craft on lockset products,classic coastal Round door knob embellish your home Style.