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Durable cotter pin designed to secure fasteners and prevent loosening in machinery. Key specifications: 40 mm (1.57 in) length, 4 mm (0.16 in) diameter, ideal for various mechanical applications. Additional specs: Fits 4 mm (0.16 in) holes, ensuring a snug and reliable fit. Made from high quality general steel. Zinc finish for enhanced corrosion resistance and longevity.