To solve the situation for the fear of inadequacy of armor security regarding currently greatly armored KV-1 Model 1941, It was made a decision to bring the armor protection associated with the turret as much as a thickness to 75mm. Because the capability of creating such a thick armor dish was lacking at the time, so an interim solution was to utilize bolt on armor, 25 mm of thickness, bolt directly to the outside of the turret and some other parts of the hull. This kind had been often called KV-1s Ehkranami.
