Interstate Pneumatics F7325-50 Brass Fitting Hose Ferrule 0.562 inch Inner Diameter x 1.0 inch for 1/4 inch hose 500 psi Pack of 50 Length: 1.0 Inch | I.D: 0.560 Inch 50 per pack Hole: 0.437 Inch Wall Thickness: 0.025 Inch For 1/4 inch hose, 500 psi