Simple auxiliary lock, "Rusufukanran-jou" (Don't know if someone's home lock), for crime prevention on front doors. Guard Lock No. 555 This auxiliary lock makes it difficult to distinguish between being home and away, as it can be left on even when you are home. ● For outward-opening single doors ● Can be installed on either the left or right handle (no left/right specific) ● Easy installation without tools or damage ● Adopts anti-picking pins ● 2 million key combinations ● Comes with 4 keys There are no noticeable damages. Please understand that this is a used item before purchasing. *Price negotiation is not possible.