IIT 10400 Heavy Duty Brass Quick Couplers Set, 5Piece, 5 Piece Heavy Duty Brass 1/4-Inch Air Quick Couplers Stainless steel ball bearing rings 1 Piece 1/4-Inch Quick Coupler 2-Inch Long x 7/8-Inch Diameter, 3 Piece 1/4-Inch Male plugs 1-5/8-Inch Long x 7/16-Inch Diameter, 1 Piece 1/4-Inch Female plug 1-5/8-Inch Long x 5/8-Inch Diameter