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Tohnichi Mfg. Co., Ltd has over 300 types of standard products. Recently it has released the AH12D series (3 models) exchangeable wrench heads. In some industries the demand for fastening is relatively smaller, and thus the required cost is higher and it is harder to manage torque. Tohnichi reacted to customers' feedback and in 2006 released AH15D series wrench head with φ15 mounting slot to attach to wrench. This time the all-new AH12D series have even lower torque and more compact size than AH15D's, and are applicable to more slot diameters.