<p>HT39 Pattern Spark Plugs Fittings Accessories<br />Spark Plug Brass Thumb Nut M4 - Champion Replica - OD 5/16"</p> <p><br />5/16" Dia. Solid Brass Thumb Nut With M4 Threads. Exact Replica Of The Thumb Nut Used On Early Champion Spark Plugs. Fits All Modern Bosch, Champion, Denso, NGK 14mm, & 18mm etc</p>
