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Screw Rolling Dies Screw Making Die. C/B Type M4 Pitch1.8 Length20 Fiber Nail Thread Rolling Plate. High Strength C/BM4*1.8*20 Chipboard Screw Rolling Mold. Wear Resistant C/B M4-1.8-20 Fiber Board Screw Thread Die. C/B M4*1.8*20 Chipboard Screw Thread Rolling Die.