Irwin Tools 1890451 Countersink Wood Drill Bit Set， 19-Piece<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Tapered drill with widened flutes for drilling fast， clean pilot holes and ensures tight fit for screws</li><li>Adjustable four-cutter counter bore cuts and clears chips quicker for fast， smooth countersinking</li><li>Counter bore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth</li><li>1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks， including impact drills</li><li>Adjustable stop collar attaches to counter bore with two hex screws for a secure fit and can be adjusted for desired counter bore depth</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51%2BnonGs%2BOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/513yR6DoKWL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/510YbDtFSvL.jpg" noproxy>