Spark Plug Code: BK5RETC Overall Length: 75 mm / 2.95 inches Spark Plug Manufacturer: Takumi Thread Diameter: 14 mm / 0.55 inches Thread Size: M14 Thread Reach: 19 mm / 0.75 inches Hex Size: 16 mm / 0.63 inches Thread Pitch: 1.25 mm / 0.05 inches / Please Note: Although this spark plug is recorded as being compatible with other listed branded plugs, it is the buyers responsibility to check compatibility prior to fitment, as not all engines and plugs are identical. All engines are at a different stage of wear and tear, and will be running at different stages of performance, we therefore take no responsibility for engine issues that arise post fitment of one or more of our plugs. Where machines are either expensive or complex, or of the high performance nature, we would always recommend the spark plugs the manufacturer recommends.