Adapter Jack 3.5mm Male to Jack 2.5mm Female ST.

RCA Male Plug with 2 Screw Terminals.

A Junction Bar 12 Cond 6a/15a Sec 1.5mm White, by Edh.

This is a common barrel-type power jack for DC wall supplies. 

Adapter Jack 2.5mm Male to Jack 3.5mm Female ST.

DC Female Power Plug 90º with 14mm.

BNC Male Socket with Screw Terminal

Crocodile Tweezers 10A isolated in red.

Adapter Jack 6.35mm Male to Jack 3.5mm Female ST.

2.5mm DC Power Connector with Crimping Terminals. Female DC Power Jack with 2.5mm inside diameter, 5.5mm outside diameter and 12mm terminals.

Soldering Plug USB-B 2p Male with Nickel Plated Structure and Polyester Insulation.