Pressure die casting is a process where metal is melted and forced into steel dies. The metal hardens into the desired shape. Molten metal is injected into a die cavity through a channel by movement of a plunger. After a preset solidification time, the plunger reverses direction, the part is ejected, and the machine is ready for the next cycle. Pressure die casting creates parts with no joints by eliminating other processes such as welding and fastening. Integral fastening elements such as bosses and studs can be included. Good dimensional accuracy and detail is possible. No further machining required usually. Casting offers low cost after amortization of tooling. Some examples of use of die casting include engine blocks, toy components, bushings, levers, gears, and assorted parts used in the automotive, aerospace and medical industries, etc.