 Many of the automotive specialty tools such as feeler gauges and gap gauges have been made by A&E Tool Company of Racine, Wisconsin (these tools will have an "S" logo in a circle).Ullman Devices of Ridgefield, Connecticut makes many of the magnetic pick up tools, picks, and inspection mirrors for Sears.Some tools have codes on them that correspond to the manufacturer that produced the product for Sears (see Alloy Artifacts website reference below).