The product is 7PC MAS Drill Bit Set</br>Easy to use</br>The product is manufactured in United States</br>Rock carbide tip maximizes carbide surface contact for longer bit life</br>Four-flute design cleans debris out for fast?? efficient drilling</br>Three flats on shank eliminate bit slipping in chuck</br>For use with electric or cordless hammerdrills</br>Ideal for drilling holes in brick?? block?? concrete?? and masonry</br></br>Product Description</br></br>Rock Carbide bits with four flute carbide head that provides longer bit life with a special enlarged flute design that channels debris out of the hole for fast?? efficient drilling into masonry?? concrete?? rock?? and artificial stone. The bits in this set are intended to make holes for mechanical anchors. No-Spin Shank to eliminate bit slippage; used with 3/8"" sized chucks. Includes: 3/16"x3"?? 1/4"4"?? 5/16"6"?? 3/8"6"?? 1/2"6" and (2) 1/4"x6".</br></br>Amazon.com</br></br>An excellent accessory for your cordless hammer drill?? this DEWALT seven piece drill bit set provides function and durability for all your rugged drilling needs.  Applications include drilling nice?? neat holes into masonry?? concrete?? rock?? and artificial stone.  Crafted for the average 3/8-inch and 1/2-inch sized chuck?? the bits in this set are intended to make holes for mechanical anchors.  The set includes the following pieces: 3/16-inch by 3?? 1/4-inch by 4?? 5/16-inch by 6?? 3/8-inch by 6?? 1/2-inch by 6 and two 1/4-inch by 6s.</br><br/>http://www.amazon.com/gp/product/B00004RHBFee fitted on