M10 x 1.0p  17mm HEX - used on Classic V12 Engines.

250 Europa, 250 GT 2+2 (GTE), 250 GT Berlinetta Lusso, 250 GT Europa, 275 GTB2, 275 GTB4, 275 GTS, 365 GTB4 (Daytona)

Please note this part is manufactured by Hill Engineering in house using an aircraft release specification steel, ultrasonically tested and manufactured far beyond the original specification.

This is another "Hill Improved" part requested for manufacture due to poor quality items being in the supply chain.