Autolite® Copper spark plugs deliver quick starts, good fuel economy and smooth acceleration. Heat-fused glass composite resistor center seal provides high performance EMI noise suppression and a 100 percent leak-proof seal High nickel alloy side electrode resists electrical and chemical wear providing excellent durability 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 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: 0.103 lb Package Quantity: 1 UPC: 009100051431 Center Electrode Core Material: Copper Center Electrode Design: Standard Center Electrode Projection: Extra-Long 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: 1.4 MM Pre-Gap Size: 0.054 IN Reach: 20.5 MM Reach: 0.809 IN Resistance: 4000 82 Resistor Type: Yes Seat Type: Tapered Thread Diameter: 14 MM Country of Origin: CN