3. The square diameter of the head of 43603 can be matched with the square hole of 43602, and it can pass through the square hole of 43602 smoothly without any jamming or other unmatchable phenomena.
3. The square diameter of the 43603 head can be matched with the 43602 square hole, and smoothly passes through the 43602 square hole without any jamming or other inability to match.
3. The square diameter of the 43603 head can be matched with the 43602 square hole, and it can pass through the 43602 square hole smoothly without any jamming or other phenomena that cannot be matched.