This large internal frames is just the thing for carpet bags and doctor's bags. Frame has flat, flex type hingesThis is the required hardware for the The Large Companion Carpet bag by Sewing Patterns by Mrs. H.Measurements: 12" long x 3.75 wideInstallation: Remove pins, insert frame into frame casing and reinsert pinsA pair of pliers may be needed to squeeze the hinge sections together so they are aligned for the pin to enter