12U405 up or sale is a Daniels Manufacturing corp Military connector remover and installer marked DHK373, this unit has a aluminum handle and comes with 6 tools that install on the end by using this aluminum cap on the silver end, the bits are marked 2B, 2E,2D, 2A, and 2C.
nice new tool from USA surplus, appears to be used on Military and Cannon type connectors, not sure specific contact size or application information, it appears Daniels is still in  business they could answer some questions if you ask, buyer to pay calculated shipping and packing to your locations, see our store we have a lot of new great items in our store, Thank you RWK .