This "safe" here refers to the safety of your electrical equipment. Fixing electrical appliances or parts of vehicles can be quite challenging. This is because you will have to take extra care to ensure while you're disconnecting and reconnecting wires from terminals, you do not damage the terminals themselves. Although this can be difficult/troublesome to do, it doesn't actually have to be.
With this terminal ejector pin kit, you will be able to easily remove/disconnect faulty wires and terminals from their location without damaging your electrical appliances. Because this terminal ejector kit actually contains different pin shapes and sizes, you will be able to use it to fix different electrical items such as cars, bikes, and other electrical tools/appliances. If it has a terminal you need to eject wire from, you can use it!