Force gimbal joint. For machine-operated socket wrench inserts and connecting parts. Internal square drive according to DIN 3121, G 25 and F 25 / ISO 1174. Made of chrome-molybdenum steel. Surface: Manganese phosphated. MATADOR is one of the pioneers of the tool industry. Since 1900 we have been producing quality hand tools "around the screw". We stand for sophisticated premium tools. Reliable, design-oriented, no frills. For people who know what they want. They are in the arena and not in the auditorium. Being able to distinguish tools from toys. Who believe in themselves. Welcome to the Arena! Be a MATADOR.