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OptiTorque TorqueMaster Series Cylinder Head Stud Kit - 12 Point Nuts - Chromoly - Nissan 4-Cylinder 17122490 Paragon’s driver cooling systems areProduct Description: Cylinder Head Stud Kit TorqueMaster 12 Point Nuts Chromoly Black Oxide Nissan 4 Cylinder OptiTorque produces premium quality fasteners for a wide range of automotive applications. From stock rebuilds to hard core racing builds, OptiTorque fasteners are USA made and designed, featuring premium materials and designed to meet or exceed OEM specs.