This drill bit depth stop setting gauge simplifies the process of setting the depth on drill bits. Simply place your drill bit in the corner of the gauge to the desired depth, apply a piece of blue tape to the bit or slide the stop collar against the edge of the gauge and tighten the Allen screw. Setting drill bit depths could not be easier. Gauge can also be used to set router bit heights. Gauge will set depths up to 3” or 80mm in 1/16ths or millimeters. Will accommodate bits up to 1-1/4” in diameter. Made from aluminum with a non-glare black anodized finish and white laser etched graduations for easy reading.