Bismarck-class battleships screw set in
1/350th scale. Suitable for Revell and Tamiya Bismarck - Tirpitz kits. The shaft holes are 2 mm (0.079") in diameter and 3 mm (0.118") in depth.
This model is designed by another designer, going by the name Ionenwalze:
https://www.shapeways.com/designer/ionenwalze/creations.