Made in Germany by Josef Bergs Co. This high quality brass open back Sew-On Setting has four holes -1 hole each side. 4 prongs are 2.7mm in length with a high wall of 4.7mm. Designed to hold most ss47/48 Chaton stones. Sold in Tombac Brass with Imitation Silver Plating, Check out our selection of stones to fit these settings!