Model double-head from three combinations; material iron; color classification 5*30 (1 nut + 1 washer), 5*40 (1 nut + 1 washer), 5*50 (1 nut + 1 Washer), 6*30 (1 nut + 1 washer), 6*40 (1 nut + 1 washer), 6*50 (1 nut + 1 washer), 6*60 ( 1 nut + 1 washer), the outer diameter of the washer is 30; head type double head; standard type national standard; category self-tapping screw
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