The Astro Tools 71019 19mm Drum Socket - Impact Torque Multiplying Harmonic Balancer Socket is designed for removal of Honda and other stubborn 19mm crank bolts. The hollow drum design in this tool multiplies the torque of your impact wrench greater than solid and flywheel style weighted sockets. Easily upgrade your mid-size impact into a high torque or take your high torque to levels not available in the power tool market with the simple attachment of a socket. This tool works with both air and cordless ½” impact wrenches.