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Hexagon head bolts DIN 931
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Guardrail Bolts are total four items:Waist Neck Guardrail Bolt ; Tenon Neck Guardrail Bolt; Square Neck Guardrail Bolt; Egg Neck Guardrail Bolt;
Square weld nuts from ITA Fasteners have four small projections in their back ends to facilitate their welding on to the surface of other metals.
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