1,Air Compressor Fittings including 5 pcs Air Accessory 2,Size:NPT1/4 3,Material:Steel Zinc-Plated AIR ACCESSORIES KIT INCLUDES: Quick Release Coupler 3 Piece Brass Male Quick Coupler Nipples 1 Piece Brass Female Quick Coupler Nipples This is a 5 Piece set of quick connect couplings for your air tools. Steel and brass construction. Quality threads ensure a long life.