The SHOCKWAVE Impact Duty Linemans Fiberglass Drill Bits are engineered for fiberglass and composite Power Utility arms and poles. Our carbide tip design allows Lineman to make faster cuts while maintaining best life. They are available in 12 -inch and 22 -inch lengths. These length assortments can pass through Power Utility Poles and Arms in a single pass, this eliminates the need to flip over the pole, line up the holes and drill through the other side. The 7/16 -inch hex shank allows for quick connection, pair this accessory with our M18 FUEL 7/16 Hex High Torque Impact Wrench (2865-20) for ultimate performance in Fiberglass/Composite poles and arms.