11K views · 39 reactions | Which set would you use? The joker self setting spanner from WERA. The red and yellow set are insulated and made to be used around electrical equipment. The other is their regular larger set. They have a patented head which self adjusts to different sizes and works similar to a ratcheting spanner. I use these alot around tray work but also for random nuts and bolts i come across on site. | Addicted to tools | Facebook