They are Hex Dom Nuts due to the dome-shaped projection on one side of the nut .This is mostly used to protect objects close to the ends of screws from scratches and structural injuries.The dome nuts come in different sizes, allowing you to use them on screws with any length. By default, the size of the nut is ‘small’ which means it is used for shorter screws.

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• DIN : 1587
• ISO : 4032
• DIAMETER : M3 to M30
• Inches- 1/4" - 1"