Kits of parts offer a shortcut to the traditional method of building. Kits fall into two categories, machined and unmachined kits. Unmachined kits usually consist of drawings, castings, stock metal, and possibly fasteners and other fixings necessary to complete the model. They require machining facilities to complete and often also require additional components and raw materials. Typically the minimum machine requirements are a lathe, drilling machine, and possibly a milling machine. A good level of knowledge about machining is necessary to successfully complete these kits. Machined kits are a set of parts that are fully machined and only require finishing with hand tools, painting, and assembly. Workshop machinery is not required. The kit will typically contain all the parts necessary to complete the model. These kits require a lot less work than an unmachined kit, but are very expensive and choice of subject matter is limited.