GoYonder 1-3/8'' Diamond Dry Drill Bits with Vacuum Brazed Outside Protection for Drilling Concrete Granite Marble Stone<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Side protection</li><li>Speed:2500-5000rpm</li><li>20-30s/hole for 3cm granite</li><li>Lifetime:80-100 holes</li><li>Size:-35mm (1-3/8'') / 5/8mm''-11/ L60mm</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41bgFfCvZDL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41p0%2BK7buHL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41JyVQE7nOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41-PsnmSXRL.jpg" noproxy>