DEWALT D180021 1 5/16-Inch Hole Saw<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Double tooth design strengthens each tooth for longer life and improved durability</li><li>Sharper tooth geometry cuts material faster for faster drilling</li><li>Thick， hardened backing plates prevent thread stripping</li><li>Deep cut style holes saws will cut 2x material in 1 pass.</li><li>Increased high speed steel height (highest in the industry) improves hole saw durability</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41xaQLKIPEL.jpg">