Diamond Products 04745 4-Inch Heavy Duty Orange Dry Hole Saw Bits<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Block and soft brick</li><li>9-Inches of drilling depth</li><li>5/8-Inch to 11 hub</li><li>Jacobs chuck adapter available for hand held rotary drills 5/8-Inch to 11 thread to straight shank</li><li>Not for use on concrete</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31hX8jTyvKL.jpg" noproxy>