LATCH LAKE WTST micKing 1100 Weight Set

I'm wondering exactly how these extra counterweights stack with the stock 2lb weight that comes stock with the MicKing 1100. My stock 2lb weight has the requisite male end thread for fastening to the micking 1100 boom end, but no female thread on the back-end for stacking additional weights.  I assume both the 4lb & 1lb weights have both a male thread and a female end thread , but I can find no  photos to confirm.  Are the 4lb & 1lb weights threaded at both ends (male & female)?  thank you!