1.Hiddn door hinge,short arm hinge. 2.Weight for about 53g/pcs. 3.America hot sales type. 4.Mount ... . Hinge,door hinge,hidden door hinge.Pressing processing, automatic assembling.Two holes mount plate.Material :steel cup nickel platedRecommended plank thickness ... holes distance: C45/C48/C52, C48 usualWeight:about 53g/pcsType:two way hinge ,American hot sales type. 48MM Cup holes distance ...