ECHO SRM-2320T Line Trimmer High Torque 21.2cc Engine Speed Feed HeadECHO SRM 2320T Line Trimmer High Torque 21. 2cc Engine Speed Feed Head ECHO's SRM 2320T straight shaft trimmer bring intense cutting performance for professionals who have light to medium cutting jobs. The 2: 1 gear ratio gives 28% more torque than the SRM 225 increasing productivity. Grab the best performing trimmer in its category. Features: 17" cutting swath 2: 1 high torque gear ratio Designed for light to medium trimming Easy tool less access to