1/2" x 10" x 12", Rock Carbide SDS Plus Hammer Bit.

The DeWalt DW5439 1/2-Inch-by-10-Inch-by-12-Inch Rock Carbide SDS Plus Hammer Bit is used for drilling holes in masonry, concrete, rock and artificial stone, and is guaranteed to set up to 25-percent more anchors than other standard masonry bits. DeWalt built this bit with a rock carbide tip that maximizes carbon surface contact for an extended bit life. And with the 4-flute design, the bit removes debris as you work for fast, efficient drilling. For added safety, the bit is designed with three flats on the shank that prevent it from slipping back into the chuck, and an innovative tip that reduces walking and increases accuracy. Used primarily to drill holes for mechanical anchors, this bit fits into standard 3/8-inch and 1/2-inch chucks. This bit measures 1/2-by-6 inches (diameter-by-length) with a usable length of four inches, and is backed by a 1-year warranty and service contract.