Features:
1) These are 3 types of distribution boxes: 10 pair, 20 pair, 30 pair
2) Item number for these are (from left to right):
a) WT-1061: 10 pair distribution box (snap locking type)
b) WT-1062: 20 pair distribution box (screw locking type)
c) WT-1063: 30 pair distribution box (snap locking type)
3) Specially for WT-1063, there are 10 pairs, 20 pairs, 30 pairs all available
4) The same box, only change the way of frame