A metal rule depth gauge to set height of router cutters & saw blades accurately. Horizontal & vertical measuring. For hand routers router tables & saw benches. 60 mm. wide aperture & accurate to 0.5 mm. 80 mm. measurement range. U section plastic injection moulding with unique cam lever lock. Steel rule dual metric & imperial scale. Self standing for setting cutter depth on router tables & low profile for back fence adjustment. Patent No. GB2386085. US Appl No. 10/784.780.