Window rack bolts are an ideal way to increase security on timber windows. They are morticed into the window and operated by a spline key that throws the bolt into the frame. For optimum security it is recommended that he bolts or fitted to the top and the bottom of the window. Backset mm 21 Bolt Dia. mm 13 Bolt Throw mm 11 Case Depth mm 42 Case Dia. mm 16 Corrosion Rating 2 - Occasionally damp/wet, rural and sheltered areas Description Window rack bolts are an ideal way to increase security on timber windows. They are morticed into the window and operated by a spline key that throws the bolt into the frame. For optimum security it is recommended that he bolts or fitted to the top and the bottom of the window. Faceplate Size H x W mm 42 x 20 Faceplate Type Square Finish Polished Chrome Included Items Key (Qty 1) Keep Size H x W mm 42 x 20 Material Steel No. of CSK Screws 6 Product Code 949951 Screw Size imp. 4 x 5/8 Screw Size mm 3.0 x 15