Feature: 1. MAIN PURPOSE: Used to connect the two piece threaded rod from the opposite end, and used to hang various items vertically or horizontally. 2. HEXAGONAL DESIGN: These long fine thread rods are hexagonal design, which has 6 sides, providing good angle granularity for tool approaching. 3. 304 STAINLESS STEEL: These hex coupling nuts are made of 304 stainless steel, rustproof and corrosion resistant, and can be used indoors and outdoors. 4. MULTIPLE USAGES: The coupling nut is suitable for the connection of bolts, studs, machine screws, threaded rods, with a wide range of applications. 5. STANDARD SIZE: With fine workmanship, these hex coupling nuts have standard size and threads, to ensure stable and reliable connection. Specification: Item Type: Hex Coupling Nut Material: 304 Stainless Steel Color: Silver Specification: M8 x 1.25-13-L20mm Purpose: Suitable for bolts, studs, machine screws, threaded rods, etc., for indoor and outdoor use. Package List: 20 x Hex Coupling Nuts