From The Anvil 91047 Electro Brassed Security Window Bolt

From The Anvil

Security bolts are designed to fit into the edge of doors and windows to add improved security.\nThey must be morticed into the door and used in conjunction with a security star key (sold separately) which turns and releases the bolt mechanism.\nSupplied with matching SS wood screws.\nOverall Length: 37mm\n Cylinder Diameter: 16mm\n Facing Plate Size: 43mm x 20mm x 2mm\n Receiver Plate Size: 43mm x 20mm x 2mm\n Oval Receiver Plate Size: 39mm x 20mm x 2mm\n Backset: 16mm