PREMIUM QUALITY:Made of zinc plated, and rust and resistance, high performance and high reliability :Designed to rotate for preventing twisted hoses and easily locks tool onto air hoses,compact size is a nice part USAGE:The sleeve guard helps to reduce the risk of accidental disconnects and protects the coupler sleeve, the sleeve must be used with all fittings works very well FUNCTION:These air compressor and fittings enable tools and airlines to be quickly connected and disconnected ,fast and easy to install WIDELY USE:1/4-Inch Industrial style interchange coupler and plugs,perfect for pneumatic tool,automobile industry,air compressor,mechanical engineering : 1. Made of heat treated hardened steel 2. Compatible with PCL Fittings. 3. Zinc plated for protection. 4. Male fitting has valve inside to prevent air escaping whilst changing between tools. Color: silver Material: iron Package Includes: 2pcs 1/4 inch NPT Female Coupler 2pcs 1/4 inch NPT Male Coupler 4pcs 1/4 inch NPT Fitting with Female Thread 6pcs 1/4 inch NPT Fitting with Male Thread Only the above package content, other products are not included. Note: Light 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.