Hexagonal with or without lifting ring (a) 50 g (b) 100 g (c) 200 g (d) 500 g (e) 1kg (f) 2 kg (g) 5kg Masses Iron Metric Hexagonal Fasteners are a versatile and reliable choice for engineers and construction professionals. Their strength, ease of use, and compatibility with metric systems make them indispensable in a wide range of industrial applications. Whether you're assembling machinery, building infrastructure, or conducting repairs, these fasteners offer the durability and precision needed for safe and secure operations.