A screw anchor is screwed into the ground by means of a special ? and the power drive on a line truck or digger.

• A. Allen key set
• B. Power head
• C. Torque converter
• D. Tubular wrench

Answer: (D)

Turning a screw anchor into the ground requires a tool that can fit the anchor’s drive end and transmit the torque from the power drive on the line truck or digger. The tubular wrench slides over the anchor and grips a square or specially shaped drive on the end, giving the operator a strong, durable interface to rotate the anchor as the power drive turns. This setup provides the leverage and torque needed without damaging the anchor or the surrounding area. Other tools don’t match the drive end: an Allen key set would fit hex sockets that aren’t used here, a power head is too generic to reliably engage the anchor, and a torque converter is a transmission component, not the hand tool used to turn the anchor.