1. The screwdriver handle can meet batch head (a word cross T word plum blossom socket head hex extension rod universal joint can receive bending bar) 2. The socket using high-quality chrome vanadium steel 50 bv30 cold-press forming, torque 50% higher than that of carbon steel, use inferior smooth surface processing, good rust prevention effect. Batch head adopts cr-v materials, stronger hardness, toughness is higher.
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