Choose the model Plastic base recess flat surface 3 contacts white Plastic base recess flat surface 3 contacts black Plastic base recess flat surface 2 contacts white Plastic base recess flat surface 2 contacts black SS base straight recess fit f.pull-out poles white SS base straight recess fit f.pull-out poles black SS base angled recess fit 2 contacts white SS base angled recess fit 2 contacts black SS base angled recess fit f.pull-out poles white SS base angled recess fit f.pull-out poles black SS bulkhead 3 contacts white SS bulkhead 3 contacts black SS bulkhead 2 contacts white SS bulkhead 2 contacts black Nylon bulkhead 3 contacts white Nylon bulkhead 3 contacts black Nylon bulkhead 2 contacts white Nylon bulkhead 2 contacts black SS adjustable base w/white knob SS Aerodinamics adjustable base Nylon + AISI316 base recess fit 2 contacts white Nylon + AISI316 base recess fit 2 contacts black Nylon + AISI316 base recess fit 3 contacts white Nylon + AISI316 base recess fit 3 contacts black Flat base for pull-out pole