Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties Corrugated Ribs Prevent Flash-over Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer Copper Core Aids in Heat Removal Triple Seals Prevent Leakage Thread Size: 10 mm Thread Pitch: 0 mm Seat Type: Gasket Resistor: No Reach: 6 mm (.339?) Hex Size: 5/8? (16 mm) Gap: .04? (1.0 mm)