NGK standard plugs are constructed for longer life and optimum performance. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage. Product Specifications - SKU: BP7HS-10, Item: NGK7829, Shell - Thread Diameter: 14mm, Thread Pitch: 1.25mm, Seat Type: Gasket, Reach: 12.7mm (1/2"), Hex Size: 13/16" (21mm), Terminal Type: Removable Nut, Overall Height: JIS, Gap: .039" (1.0mm), Centre Electrode - Material: Nickel, Type: Standard, Size: 2.5mm, Projection: Projected, Ground Electrode - Material: Nickel, Type: Standard, Quantity: 1, Specifications - Resistor: No, Resistor Value: 1K Ohm, Heat Range: 7, Torque Specs: Cast Iron: 18-25.3 lb ft. Aluminium: 18-21.6 lb ft., Part Information - Brand: NGK/NTK, Warranty: 60 Days, Longevity: 30k Miles.