A detachable window stay is a device that is used to hold a window open at a specific angle or position. It is typically attached to the window frame and has a mechanism that allows it to be easily removed or detached when not in use. The size of the stay, as indicated by the "101mm" measurement, refers to the length of the stay.

Window stays are used to hold windows open for ventilation or to allow natural light to enter a room. They are typically used in residential or commercial buildings. Some window stays can be adjusted to hold the window open at different angles or positions, while others are fixed and can only hold the window open at a single angle. In addition to holding windows open, window stays can also be used as a security measure to prevent the window from being opened too far or from being forced open

• Extended enclosed end cap to enhance weather sealing Asymmetric location system for reliable weather sealing
• Handed ‘profiled’ vent arm further enhancing weather seal
• Patented-lipped slider for enhanced smooth operation
• Easy friction adjustment without metal-to-metal contact
• Long and reliable working life tested to 30,000 cycles
• Unique patented, robust cam friction device eliminates any risk of friction screw misuse