Tap wrench material: use of tap wrench No. 45 overall in carbon steel or 40Cr alloy steel forging production. Tap wrench manufacturing standards: GB/T4392-1995 (tap wrench and hit the wrench). Tap wrench features: tap wrench from high quality carbon steel or high-quality forged alloy steel as a whole, with reasonable design, stable structure, material density, anti-strike capability, not off, constantly, bend, dimensional accuracy of the product high durability and other characteristics.