Autolite® Copper spark plugs deliver quick starts, good fuel economy and smooth acceleration. One-Piece terminal stud provides a reliable high voltage electrical connection Solid copper core center electrode provides optimal thermal and electrical conductivity for better performance in all driving conditions High nickel alloy side electrode resists electrical and chemical wear providing excellent durability Heat-fused glass composite resistor center seal provides high performance EMI noise suppression and a 100 percent leak-proof seal High alumina multi-rib insulator helps prevent flash-over which can lead to misfires 2 year limited warranty Package Dimensions: 1.00 x 1.00 x 3.38 inches Package Weight: 0.073 lb Package Quantity: 1 UPC: 009100254191 Center Electrode Core Material: Copper Center Electrode Design: Standard Center Electrode Projection: Mid Projection Center Electrode Tip Material: Nickel Electrical Terminal Type: Stud Ground Electrode Core Material: Nickel Ground Electrode Quantity: 1 Ground Electrode Tip Design: Tapered Ground Electrode Tip Material: Nickel Hex Size: 16 MM Hex Size: 5/8 IN Insulator Material: Ceramic Pre-Gap Size: 0.025 IN Pre-Gap Size: 0.6 MM Reach: 7.69 MM Reach: 0.303 IN Resistance: 1 82 Resistor Type: No Seat Type: Tapered Thread Diameter: 14 MM Country of Origin: CN