Obviously bone, gonna do a couple at a time...First one is a deer leg bone handle set to receive a blade of some sort,and recovered from the Santa Fey River,
I had another just like it, gave it to a friend...Next is an antler handle from the Weeki Wachee river..Thanks for lookin.
To me, your antler handle (last 4 pics) looks more like a flintknapping billet. The bur where it attached to the deer's head is the business end and it has been properly prepared for knapping. Old antler is rare here due to the acidic soil. Neat find. Gary