Autolite® Copper spark plugs deliver quick starts, good fuel economy and smooth acceleration. High nickel alloy side electrode resists electrical and chemical wear providing excellent durability Solid copper core center electrode provides optimal thermal and electrical conductivity for better performance in all driving conditions One-Piece terminal stud provides a reliable high voltage electrical connection 2 year limited warranty High alumina multi-rib insulator helps prevent flash-over which can lead to misfires Heat-fused glass composite resistor center seal provides high performance EMI noise suppression and a 100 percent leak-proof seal Package Dimensions: 1.000 x 1.000 x 3.375 inches Package Weight: 0.11 lb Package Quantity: 1 UPC: 009100253231 Center Electrode Core Material: Copper Center Electrode Design: Standard Center Electrode Projection: Short 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: 0.9 MM Pre-Gap Size: 0.034 IN Reach: 0.431 IN Reach: 11 MM Resistance: 5000 82 Resistor Type: Yes Seat Type: Tapered Thread Diameter: 14 MM Country of Origin: CN