Internally, one side of the box is parallel with, and the other inclined to, the lead of the rope, thus making the opening at one end wider than at the other.
Ngaphakathi, elinye icala kwibhokisi ezinxusene kuyo, kwaye kwenye ayikhatywanga kuyo, ukukhokela intambo, oko kukwenza uvuleko kwesinye kwisiphelo ebuvuleka kunezinye.