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These Self Locking Nuts provide reliable performance for secure fixings on beds, tables, bicycles and other applications. Manufactured by DOJA Barcelona to meet rigorous quality standards. Featuring a built-in nylon insert, these Locknuts resist loosening under vibration and torque. Suitable across industrial, mechanical and domestic sectors—from mining machinery to automotive transport, agricultural equipment, construction, shipbuilding, electrical devices and general DIY. Crafted from galvanised steel with a durable zinc finish, our Insert Lock Nuts combine strength with corrosion resistance. Available in sizes M4, M6, M8, M10 and M12, with various pack options to suit every requirement. Pack of 50 precision-engineered Hex Nuts in M4 size, ideal for garages, workshops or home improvement projects. [IMPORTANT] - 100% SATISFACTION - If you have any issues with our product, please contact us for assistance. We are here to help with any questions or concerns you may have.