These high pressure hoses are nitrox ready, have chromed brass fittings and are designed to conform to the EN 250:2014 standard with a maximum working pressure of {5000 psi | 350 bar} and a burst pressure rating of {20000 PSI | 1400 BAR}.  7/16-inch male end screws into the first stage HP port of your regulator, and a 7/16-inch female end to attach an SPG. Gauges require a "swivel spool" that will fit between the hose and the gauge. Swivel spools typically come with a gauge when purchased, but they can also be purchased separately.