Bosch HC6521 2-1/2-Inch x 18-Inch x 24-Inch Wild Bore Thru-Hole Multi-Cutter Head SDS Max Rotary Hammer Bit<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Carbide tipped bit head is harder， tougher， and more resistant to extreme loads</li><li>2-1/2" diameter， 18" useable length， 24" overall length</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31C0TSAJFKL.jpg" noproxy>