These Prima Series of professional shower door hinges are able to accommodate 5/16 to 3/8 inch (8 to 10 millimeter) tempered safety glass. A variety of four styles, including Wall Mount and Glass-to-Glass types, gives design flexibility. They are made of solid brass with all moving parts (pins and springs) in stainless steel. Prima Shower Door Hinges are self-centering, with four springs for maximum retention strength. This shower door hinge is used by several shower door manufacturers.