Female thread,304 stainless steel material.This rod coupling is designed with female thread and hex rod.Installed with sleeve anchor, wedge anchor and all thread rod, etc. Specification:Product Name: Hex Coupling NutMaterial: 304 Stainless SteelThread Size: M16 - 2Hex Width: 24mm / 0.94"Length: 50mm / 1.97"Grade: 4.8Package Content: 2 pcs x Hex Coupling Nut