Interstate Pneumatics F7322-50 Brass Fitting Hose Ferrule 0.500 inch Inner Diameter x 1.0 inch for 1/4 inch hose 500 psi Pack of 50 0.500 Inch Inner Diameter x 1.0 Inch Ferrules 50 per pack Wall Thickness = 0.5 mm Material: C46500 Brass For 1/4 inch hose, 500 psi