The built-in compensator allows casing travel during thread make-up. The tool's locking mechanism allows it to be set and released with minimal torque and eliminates the need for any top drive set-down weight. One actuator head is used for 4-1/2"-20" casing with some configurations having as few as 50 parts. The modular design provides maximum versatility while keeping both operating cost and inventory low. These key features make the DWCRT the most versatile CRT on the market.