Irwin Industrial Tools 10225 Unibit General Purpose Step Drill Bit Set， 4-Piece<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Single-flute cutting edges for greater control through steps</li><li>3-flatted shanks prevents slipping in drill chuck</li><li>Non-skid self-starting tips eliminate skidding and the need for center punching</li><li>Sizes clearly laser-etched to make precise drilling easy</li><li>Set includes HSS #1， 2， 4， and 21 size step drills</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51uLnHtFdUL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31OQt6gYUAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31lqHE4NHPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/3144v3TDVHL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31A0m63oqQL.jpg" noproxy>