Feature●Product Type: Auto Part●Model Number: 66755●Item Package Dimension: 6.75" L x 4.5" W x 1.75" H●Item Package Weight: 0.65 lbDescription Wedge-Locking Header BoltsLS Engines with 3/8" Header Flange8mm Diameter, 1.181" LongNickel Plated Finish12/pkg