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SouthOrd model DSS-4 Double-Sided Pick Set. Spring steel flat picks are single-ended but double-sided . . . the business end is forked, the two prongs with different profiles.
These picks work wonders with double sided wafer locks such as Chicago Locks, found often on gas pumps and tool boxes.
It should be noted that these picks are useful for applications other than to pick regular wafer style locks. I've had success with this set picking automotive locks that are double sided (most are nowdays).