Disston E0102422 1-7/8-Inch Boxed Blu-Mol Bi-Metal Hole Saws， 48mm<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>M42 cobalt bi-metal cutting edge provides shock resistant teeth and resists tooth slippage</li><li>4/6 positive tooth configuration allows for fast， smooth cuts and less vibration</li><li>3/16-Inch back plate eliminates need for drive plate</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41kUrlTEK0L.jpg" noproxy>