This flush bolt features a strong spring mechanism and is suitable for use on sliding/folding door systems. Maximum depth of cut out: 25mm. Normally used to secure the slave door, this bolt must be rebated into the surface edge of a door. Overall Size: 154mm x 19mm Return Length: 15mm Receiver Plate: 42mm x 19mm x 2mm Shoot Bolt Diameter: 11mm Maximum Cut Out Depth: 25mm