Material: special tool steel, hardened and tempered Surface finish: chrome plated according to ISO 1456:2009 The wrench is used for unscrewing and tightening of front chain ring nuts. The tightening starts with the broader part, and when the nut is sufficiently tightened, it finishes with the narrower part which is bent in order to enable more secure power transfer during the final tightening of the nut. When unscrewing the nut, the key is used in the reverse order. The dimension of the hexagonal key opening is SW10. It enables unscrewing and tightening of nuts of this dimension, while at the same time it can be used to hang the key. Tools with verified quality Unior Hand tools are in compliance with the European and global quality standards. Unior is striving to assure the high quality of hand tools also as a fully authorized CEO (European Tools Committee) member. Unior was among the first manufacturers of hand tools in Europe to receive ISO 9001 quality certificate. In 1994, the company received ISO 9001 quality certificate for the development, production and marketing of hand tools, sheet metal housing for hand tools and mechanical processing of forging parts. Unior tools are in compliance with DIN standard. Since 1991, the tools for working at high voltage also proudly hold VDE certificate, issued by VDE Institute- "Pruf und Zertifizierungsinstitut" from Offenbach in Germany.
