In terms of normal adult size, the inner diameter of the front bottom is 57 cm wide, the upper mouth is 42 cm wide, and the height is 60 cm. The rear bottom is 35 cm wide, the upper mouth is 30 cm wide, and the height is 35 cm. The length of the bottom mouth is 1.7-1.75 meters. The upper mouth is 1.8-1.85 meters long.
No matter the size of the coffin, the inner diameter and width are the same. The so-called two-four, three-five, and four-six are all based on the thickness of the coffin plate. The rear panel is less thick than the front. Generally, a coffin must be two meters four in length (the craftsman's ruler is seven feet three inches). As the saying goes: seven feet three walks all over the sky.
