It's a hex bit socket. It has a 3/8" square drive. Those are the basics.
More specifically, the bit itself is made from premium carbon steel, while the socket part is of chrome-vanadium. The entire tool is hardened and tempered and manufactured to DIN 7422 standards.
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At Unior Bike Tools, we prioritize reliability and durability in every tool. Our products are made from top-quality materials, manufactured to the highest standards. From wrenches and pliers to bike repair stands and automotive equipment, our comprehensive range meets all your needs. Our rich heritage and commitment to excellence have made us the trusted companion of professionals and enthusiasts alike.