This concealed thumbturn features a simple Square cover that brings a contemporary edge to a traditional design. Maximum door thickness: 67mm Supplied with matching SS bolt through fixings & SS wood screws. Each of our thumbturns have been designed to complement our collection of mortice knob sets and lever on rose handles. Fixing Plate: 53mm x 53mm x 8mm Thumbturn Size: 36mm x 15mm Projection: 45mm Spindle Size: 5mm