The Milwaukee SHOCKWAVE Impact Duty square recess bit is easy to use. To ensure proper compatibility, be sure to verify the proper drive size. This square recess bit has a #2 drive. This square recess bit is made of alloy steel with a finish. When shopping for a square recess bit, be sure your application requires fits a square recess configuration. The overall length measures 6 in. Packaged 5 pieces per package.