(Note: Measurements are outside max. dimensions unless stated otherwise).18th Century : English style escutcheon with very small 0.5mm bobbin flange overhang.Overall height 23mm. (7/8")Width 12mm. (7/16")FLANGEOutside height 21.5mm. (7/8")Insert width top 10.5mm. (3/8")Insert width base 10mm. (3/8")Depth 5mm. (3/16")Thickness of flange (variable) 2mm. (1/16")KEYHOLEHeight 18mm. (11/16")Diam. of hole 7mm. (1/4")Width at narrowest part of neck 5mm. (3/16")Width at base of taper 7mm. (1/4")Usually glued in or could be pinned from inside flange.