N3 Hot Nitro Engine Glow Spark Plug for RC HSP 1:10 1:8 Car HEX Size 8mm (Pack of 6) Thermal type spark plug suitable for 5% -40% methanol fuel Application: SHP /unlimited oil tanker/ Kyosho / HPI Part Name: #3 N3 Glow-Plug Part No: 70117 HEX Size: 8mm