Overhead Lineman’s Wrench (OHW Series) The OHW Series Overhead Lineman’s Wrench have 3/4″, 1″ and 1-1/8″ square drive sockets on a single head for use on 1/2″, 5/8″ and 3/4″ hardware. The wrenches have an open center to allow the bolt to pass through. The wrenches also have a large reversing lever and a padded handle. The OHW Series also includes a two-sided 3/4″ and 9/16″ 12 point ratcheting box wrench on opposite end.