Widely applicable: The joint is suitable for NPT (American standard 60-degree tapered pipe thread), used in many occasions, such as pneumatic equipment, automotive industry, air compressors and mechanical engineering High-quality carbon steel: surface galvanized material, not easy to rust, corrosion-resistant, longer use time Equipped with safety lock: used to insert into the locking hole on the connector to ensure the air hose service end is connected correctly Save money and effort: a tape is included, saving you the time and money of buying another one Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Silver Material:carbon steel Package Contents: 4 Sets * 3/4inch NPT Air Hose Fitting Female Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.