The DR5HS SPARK PLUG (86-4623) is a high-quality alumina silicate ceramic insulator with excellent strength and thermal expansion. It is composed of 98% pure copper core that improves heat dissipation and avoids spark plug overheating for more reliable starts. Anti-seize and corrugated ribs are no longer required to prevent flashover because of the trivalent plating. The high-quality material composition ensures the product s durability, optimum performance, and anti-corrosive feature for long-term dependability. Key Features: The anti-corrosion and anti-seizing capabilities of trivalent metal plating are unrivaled. Ridged ribs stop flashover The copper core aids with heat dissipation. Ceramic insulator made entirely of pure alumina silicate for enhanced strength and heat transfer. Triple seals keep leaks at bay. The design promotes easy installation and removal. Cold-rolled threads hinder cross-threading and cylinder head damage. Honda outboard engines are compatible. Specifications: SKU: 86-4623 Weight: 0.15 LBS Quantity/Pkg: 10 Thread Size: 12mm Thread Pitch: 1.25mm Seat Type: Gasket Resistor: Yes Hex Size: 18mm Resistance: 5K Ohm Reach: 12.7mm (1/2") Gap: .028" (0.7mm) Terminal Type: Threaded Stud UPC: 087295046234 Brand: Autowares Condition: New