Fowler's Inch/Metric Dial Depth Gage gives fast, accurate and easy to read depth measurements with inch graduations in black and metric graduations in red.Hardened stainless steel throughout.Positive locking screw. Thumbroll for rapid setting.Beam .630" wide and .128" thick.4" /100mm Length BaseRaised sliding surface prevents wear and defacement of graduations.Includes fitted case.