Universal, Professional Drain Wrench, For Strainer Lock Nuts & Drop In Shower Drains, Unique Patented Design Fits Hex Nuts & All 4, 6 & 8 Tab Locking Nuts On Strainer Drains, Square End Is Specifically Designed For Tightening Stand Up Shower Drains, Fits Into The Internal Locknut Slots Of All Major Manufacturers Plastic & Brass Drains.