Sink Drain Wrench Rubber Zinc Compatible with Manufacturer Part Number 03710 Hex Wrench Size 4 1/4 in Overall Length 13 in Overall Diameter 5 3/8 in Fits Hex Nuts and All 4- 6- and 8-Tab Locking Nuts on Strainer Drains. Square End of the Tool is Specifically Designed for Tightening Stand-Up Shower Drains Use With Locking Nuts on Strainer Drains Drop in Shower Drains Sink Baskets Sink Drains For Inside Diameter 4 1/4 in SAE Not Adjustable Self-Adjusting