Superior Tool Universal Professional Drain Wrench. It is designed for strainer lock nuts and drop-in shower drains. It fits hex nuts and all 4, 6 & 8 tab locking nuts on strainer drains. The square end is specifically designed for tightening stand-up shower drains. It fits into the internal locknut slots of all major manufacturers plastic and brass drains.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov