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This pack of 750 Knurled Locking Safety Washers by Beneri S.p.A. is the perfect addition to any industrial or DIY project. Made of carbon steel with a phosphate finish, these washers have a thickness of 1.30 mm and a hardness of HRC 44-50. Designed for use with bolt diameter of 16 mm and bolt grade of 8.8, these washers have an inside diameter of 17.00 mm and an outside diameter of 24.00 mm. Manufactured in Italy, these washers conform to the metric system of measurement. Use these lock washers to prevent loosening of bolts and ensure safety in your projects.