This is a new never been opened item. For routing the faceplate and mortise for specific size locks quickly and accurately. Quick and easy to set up using engraved markings for 100's of lock sizes. No need for marking out in the conventional way. For doors 30mm to 80mm thick. Made from 12mm thick laminate, with sliding phenolic plastic plates with engraved sight lines. Engraved for 16mm & 19mm lock body widths and 22.5mm & 25.4mm face plate widths. Length of the aperture in the jig can be adjusted from 30mm to 250mm. Engraved on underside to allow set up for 35mm, 40mm, 44mm and 54mm doors widths.