Set of 4  BUNDLES of diagnostic test leads, each bundle has 6 male and female connectors on that I use in most of my videos to diagnose and rectify electrical faults on components. Brilliant bit of kit for voltage and resistance Testing components as your not damaging connectors, the terminal sizes used in bundles are:
 
Yellow Color :0.6 mm
Blue Color:1.5 mm
Red Color:2.3 mm
Black:2.8 mm
 
Banana plug ends are 4mm and each lead has 6 individual male and female spade connector for you to use to test things correctly.