NEO 1/2" Spline socket (ref. no. 08-580) is made of durable chromium vanadium steel in accordance with DIN 3124. Spherical socket shape allows for versatile use for undoing screws: Torx, Spline, bihexagonal, metric, imperial and square. Tool quality confirmed with TÜV certificate and 25 years manufacturer's warranty. NEO brand meets expectations of professionals.