Hitachi H4 knurled aluminium locking nut, 4mmxM6

EM-Tec JV70 versatile dovetail SEM stage adapter (total height 14.5mm) with M4 screw for JEOL SEMs 7X00F series, 6700F, 6500F, JIB4600, JIB4700F, iT300’s/500’s/700’s/800’s and F100