This is the Thunder Tiger "Redline" R3 glow plug. The R3 glow plug is specifically designed for airplane and helicopter engines. It provides great performance in the entire operational range, from stable idling to smooth accelartion. The R3 is a medium length, idle bar-less glow plug featuring a platinum alloy filament. This glow plug has been widely accepted by serious aircraft and helicopter modelers. If you are accustomed to glow plugs such as the O.S. #8 and the Enya #3, you will like the Redline R3.
This is a short plug similar to the O.S. range of glow plugs.