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High performance alloy steel for maximum strength. Thin wall, precise metric size. 1/4" square insert compatible with aircraft parts. Ribbed area for optimal grip. Profile Dynamic‑Drive protects screws, bolts and tools. Conforms to ISO 2725-1, 1174-1 and DIN 3120. Perfect for precision assemblies. Long series hexagonal design for easy mounting. Vaso in blister for safe transport. Ideal for the aviation and hardware industry.