Interstate Pneumatics F0626-50 0.375 inch inner Diameter x 0.488 inch Brass Hose Ferrules for 1/4 inch hose working pressure 500 psi burst pressure 2000 psi 50 per pack 0.492 inch Inner Diameter x 0.551 Inch Ferrules Pack of 50 Wall Thickness = 0.020 Inch Material: C46500 Brass 0.374 Inch