A metal rule depth gauge to set the height of router cutters and saw blades accurately horizontal vertical measuring for hand routers router tables and saw benches 60 mm wide aperture accurate to 05 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 and low profile for backfence adjustment patent no gb2386085 us appl no 10784780