Accurate Depth Stop, allows users to adjust depth of drilling in concrete * Adjustable for all 1/4-Inch, 3/8-Inch and 1/2-Inch drop-in anchors * Proprietary System works with DEWALT 3/8-Inch, 1/2-Inch and 5/8-Inch SDS+ bits * Includes a 1/2-Inch by 6-Inch Solid Rock Carbide Bit * Four flute design cleans debris out for fast, efficient drilling