[Material] The connector is made of 100% solid brass for corrosion resistance, high temperature ductility and low permeability. It withstands hot and cold pressure processing well. Maximum pressure rating is 300 pounds per square inch with a temperature range of -40 to +250 degrees Fahrenheit. [Application] For use with plastic air hoses such as PU/PVC, 1/4inch barbs can be used on hoses with a 1/4inch ID x 3/8inch OD (10x6.4mm) or 5/16inch ID x 15/32inch OD (12x8mm). NPT standards and can be widely used garages or specialty auto stores to give old hoses a new lease ! [Package includes] 4PCS 1/4inch Barb x 1/4inch NPT Male Pneumatic Replacement Fitting. (Set of 4 hose fittings with 4 nuts) [Easy to use] Step 1:Use a hose cutter to cut off the disconnected portion of the hose and trim the cut flat.:Pass the smaller end of the nut through the air hose and insert the barbed end inside the hose. Step 3:Tighten the nut and fitting with a wrench. Colour:Gold Material:brass Package Contents: 4 * Air Hose Splicer 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.