Hitachi 728023-1/4-Inch Diamond Core Bit with Water Cooling System<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Glass and tile bit measures 1/4-inches in diameter</li><li>Drill bit drills through glass， marble， class 5 porcelain， granite and slate</li><li>Constructed of hardened and tempered thin wall alloy steel</li><li>Requires water lubrication during use</li><li>Comes with a 30-day limited warranty</li><li>1/4-inch Diamond Core bit with water feed</li><li>Drill through porcelain， marble， slate， and glass</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Kpf2-iTkL.jpg" noproxy>