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 2 year limited warranty 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 One-Piece terminal stud provides a reliable high voltage electrical connection Package Dimensions: 1.00 x 1.00 x 3.38 inches Package Weight: 0.141 lb Package Quantity: 1 UPC: 009100259400 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: 21 MM Hex Size: 13/16 IN Insulator Material: Ceramic Pre-Gap Size: 0.03 IN Pre-Gap Size: 0.8 MM Reach: 0.433 IN Reach: 11 MM Resistance: 1 82 Resistor Type: No Seat Type: Flat Thread Diameter: 14 MM Country of Origin: CN