Cam&groove coupling Brass. Size:1/2"-- 6", Type: A,B,C,D,E,F ... x Female NPT/BSPT Standard: DIN EN 14420-7-2005Material:1) body: Brass2) Handle: Brass(Forging)3) Ring: Steel( ... Zinc plated)4) Thread: Male/FemaleFeature :1) Precisely machined for accurate fit, join fast and save effort2 ... groove and great resistance to vibration.4) Size:1/2", 3/4", 1" , 11/4", 11/2", 2 , 21/2", 3", 4", 5", ...