This is a set of 2 auxiliary locks (black) to prevent intrusion from windows. It can be easily installed without tools and is useful for home security. It can be used for both the upper and lower frames, and is compatible with sashes and window frames of approximately 28-42mm. Installing them on the top and bottom of the window will increase the security effect. Although it is an unopened, unused item, please understand that it has been stored at home. Due to the thickness, it will be simply packaged without bubble wrap and shipped via Yu-Packet Post Mini (⁎ᴗ͈ˬᴗ͈⁎) Product Name: NEW Window That Won't Open - Size Adjustment: Approximately 28-42mm - Purpose: Security window lock - Quantity: Set of 2 - For upper and lower frames - No tools required