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Prevent intake leaks with ARP's quality fasteners. They're super strong and precision machined for optimum thread engagement. Wide underhead flange and companion washers provide even load distribution. Precision rolled threads prevent galling while promoting more consitent torque loading. Also facilitates optimum sealing of gasket surfaces. Available in your choice of black oxide finished chrome-moly or corrosion resistant stainless steel, as well as hex or 12 point heads. Both materials are nominally rated at 170,000 psi. washers are included.