Miter gears are one kind of bevel gears where the two rotational axes intersect. When talking about narrow description of bevel gears with ability to increase or decrease speed, miter gears don’t have that ability due to the pair’s same quantity of teeth. Their purpose is limited to the switch in transmission path. Because they are a type of bevel gears, the basic characteristic of bevel gears exist such as miter gear china presence of gear types of straight cut, spiral slice and types.
Also, since the shafts can be set to any kind of angle, there are miter gears with non-90 degree (non-perpendicular) angle called angular miter gears. Ever-power is usually capable of producing angular miter gears with shaft angles in the range of 45 to 120 degrees.
Because a pair of right tooth miter gears gets the same number of teeth, 
apart from small differences such as place screw holes and key ways, the same two gears may mate with each other. However, in the case of spiral miter gears, even though the amount of teeth are the same, the twisting directions will vary. Therefore, the same equipment cannot be meshed together, and it is required to pair the proper and still left handed pairs.
Bevel gears are classified in various types according to geometry:
Straight bevel gears have conical pitch surface and teeth are direct and tapering towards apex.