A Repair Kit or service kit is a set of items used to repair a device, commonly comprising both tools and spare parts. Many kits are designed for vehicles, such as cars, boats, airplanes, motorbikes, and bicycles, and may be kept with the vehicle in order to make on-the-spot repairs. Some are considered essential safety equipment, and may be included survival kits. In the military, personnel crossing large water bodies in aircraft may be equipped with a raft and raft repair kit. Other kits, such as those for watch repair or specific engine components, are used by professionals. Depending on the type, a repair kits may be included when buying a product, or may be purchased separately.