Includes (2) Spark Plug. Type: Resistor, Reach: 9.5mm, Seat Type: Gasket, Heat Range: 8, Thread 14mm, Hex Size 3/4", New, Bulk Packed. Genuine OEM Replacement Part # RCJ8Y-2PK. Consult owners manual for proper part number identification and proper installation. Please refer to list for compatibility. Compatible with the Following: HOMELITE: HG600, HGE3500, HL2500, HL4400, HLE4400, LR2500, LR4400, LR5500, LRE4400, LRE5500, LRI2500, LRI4400, LRI5500, LRIE4400, LRIE5500, HONDA: EM500, EM500K1, EM600, MCCULLOCH: Pro 2300E, POWERMATE: PM4500, YAMAHA: EF600, ARIENS: 520, 522, M21, SS322, ST524