This brass effect window bolt is ideal for securing windows from the inside. Yale recommend that 2 bolts are used on each frame. Bolts are concealed within the window. This pack contains 6 bolts. It is recommended to use two bolts per frame. Studs are hidden in the frame. Suitable for wooden sliding windows. Comes with a 2 year warranty. Weight: 0.31 Pounds. Manufacturer: Yale.