Heittis Let you experience quality home improvement life.Entry Door Lock with keyed alike:The key is universal and opens all door locks in the package, with 3 keys for each lock.(External) is locked/opened by the key. (Interior) can be locked/opened by thumb button. Suitable for rooms that require a key, such as front doors/entrances.Entry door locks with different keys:The keys are not universal, each lock comes with 3 separate keys. (external) locks/opens by key, (internal) can be locked/opened by thumb button. Suitable for rooms that require a key, such as front doors/entrances. Privacy Door Lock(Keyless):Keyless, can't be opened from the outside after being locked internally. (Internal) Locked/opened by turning button, suitable for bedroom/bathroom, private space, etc.Passage Door Lock(Keyless): No key, no internal swivel lock function, only keeps door closed or open. Suitable for rooms that do not require a key/locking feature. For example, passageways/halls/closets/closets.Product Introduction? Color: Stain Brass? Product Material: solid zinc alloy? Product Standard: ANSI Level 3, more than 200,000 cycle.? Product Packaging List: installation instructions, external control levers, internal control levers, latches, screws, fittings required for installation. ? Applicable Specifications: Adjustable Latch with Backset 60mm(2-3/8) or 70mm (2-3/4 );Fit all doors 35 to 45 mm ( 1-3/8 to 1-3/4 )thick,Notice: The latch plate is square, and can't removable.