Qingdao preco imp. & exp. co., ltd. is one of the leading manufacturers of f clamp. We continue to grow and offer customers the very best in products, service, and prices since established. hand taps series manufactured by PRECO include multiple types. And the products shown below belong to this type. Straight Shank Twist Drills can not be competitive without the changing design of long drill bits. Processed by heat treatment, it has excellent mechanical properties. The energy efficiency of this product brings lots of benefits. It does not only contributes to the reduction of electricity costs but also helps conserve energy and resources for the environment. Under the quenching treatment, its hardness and toughness have been enhanced.
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