Hex spacer 5/16 x 4-5/16 inch #6-32 taps
Ships from US and is sold by Marco Specialties$7.00
Hex spacer 5/16 x 4-5/16 inch #6-32 taps
#254-5018-00
Aluminum hex spacer post 5/16 x 4-5/16 long has #6-32 thread taps at both ends.
Reference:
0.566 oz