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Made from turned carbon steel, galvanised, blue passivated
A2 stainless steel
For increasing the head penetration resistance for countersunk head screws with a 90° head
For optimum transfer of tensile loads for metal/wood connections with ASSY countersunk screws.
For optimum transfer of tensile stresses for metal/wood connections with ASSY 4 or ASSY 3.0 stainless steel countersunk head screws in outdoor areas exposed to the elements