CREATE TABLE table_74304 ("For shank type" TEXT, "Singer part number" TEXT, "Uses templates?" TEXT, "Description" TEXT, "Storage case" TEXT)

What's the shank type of the buttonholer with red plastic box as storage case?
SELECT "For shank type" FROM table_74304 WHERE "Storage case" = 'red plastic box'
SELECT "For shank type" FROM "table_74304" WHERE "Storage case" = 'red plastic box'