General purpose frame spacers. Rob Neep design. From my late father’s extensive collection. Been stored for years. a sheet of metal photo-etched hobby parts, likely used for model railway chassis construction. The text on the sheet identifies them as "GENERAL PURPOSE FRAME SPACERS" for a "PERSEVERANCE CHASSIS". They are designed to be cut out and used to separate and align the side frames of a model locomotive. These are often made from brass or nickel silver for durability and ease of soldering.