KEEPERS/LOCKS - Mitsubishi 4G63/Evo 6.5mm Stem (fits BC2100 retainers)
6mm stem diameter, 6° billet performance valve stem keepers or locks are designed to fit BC and OEM retainers. Precision machined from premium billet bar stock chromoly steel and heat treated for maximum strength to insure against shoulder shearing (common with stock and lesser quality brands).