Suitable for use with a multitude of heavy duty locks, latches, and thumbturns for various purposes. We recommend using a 3", 4", or 5" latch/lock. The strength of the spring used in heavy-duty lock/latches will ensure the knob returns to its original position. Knob Size: 41mm Dia Projection: 70mm Rose Size: 60mm Spindle Size: 8mm (Threaded)