Description A stainless steel M12 x 1.5mm threaded boss for coolant or air temperature sensors, etc. 20mm wide x 22mm tall. Aluminium ones are available in a seperate listing. Note: These bosses may need cutting down to aprox. 10-12mm height for use with out universal M12x1.5mm air temperature sensor. They are fine as they are for the coolant / oil temperature probes.