5 Sided Pocket Watch Key For Winding Watch Mainsprings This is a new 5 sided pocket watch key Great for winding watch mainsprings Has sizes 3, 5, 7, 9 and 11 The hole sizes are 1.65, 1.50, 1.30, 1.15 and 1.00 mm Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.