Special hook-shaped wrench production process: forging process, with high strength, wear resistance, long life. Material: 45 # steel, high-quality hardened tool steel. Maximum can do to 480-500mm, welcome to the major customers call to order a variety of hook wrench. Also known as the crescent-shaped steel hook spanner wrench, commonly known as the hook or hook spanner wrench, tighten the turn for the thickness of the restricted flat nuts; dedicated to the round nut dismantling vehicles, machinery and equipment on the slot into a rectangular slot and a circular slot hook wrench production process: Use high-quality forged steel at high temperature, high strength, wear suitable round nut diameter range:. S: 22 ~ 26 S: 28 ~ 32 S: 34 ~ 36 S: 38 ~ 42 S: 45 ~ 52 S: 55 ~ 62 S: 68 ~ 72 S: 78 ~ 85 S: 90 ~ 95 S: 100 ~ 110 S: 115 ~ 130 S: 135 ~ 145 S: 150 ~ 160 S: 165 ~ 170 S: 180 ~ 200 S: 200 to 220 advantage of special tools: 1, the material is chrome steel, German quality, through the 300T-1600T large friction forging presses high product density, shape nice, good mechanical properties. 2, the company's high-grade special tool steel has more than 60 series, more than 1200 specifications, exporting more than 30 countries and regions. Excellent product quality and upscale exterior design by foreign customers 3 praise, the product passed ISO9001:. 2000 quality system certification, tool production, supply, sales strict management 4, strict internal quality assurance of products, welcome to buy products meet national standards GB / T4388-4393-1995... Striking Tools in full compliance with the German DIN7444, DIN133 steel tool surface treatment processes Description: oxidation (blue or black): The steel parts into caustic soda, sodium nitrate solution treatment, the surface layer of thin parts Process black oxide film, called oxidation treatment, referred to as blue or black. Packaging: Packaging: cartons, bags, etc. Customers can also request processing.