Primefit IP1414MS-B25-P 1/4-Inch Steel Male Industrial Plug Contractor Pack, 25-Piece Industrial / M-Style Interchange - Adapts to all Industrial / M-Style couplers Zinc plated steel construction for corrosion resistance and longer life 1/4-Inch Body size 1/4-Inch Male NPT threads For use with air tools with Female NPT ports