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Bulldozer Excavator Assembly Bolts Grade 12.9 Track Shoe Bolts and Material Grade: 45 Steel; Quality Level: 12.9, 10.9, 8.8, 6.8, 4.8 Grade Sizes: M20,M24, M27,M30,M33,M36,M42,M45; Specifiion: M48 x ...