Miter gears are a single type of bevel gears where in fact the two rotational axes intersect. When speaking of narrow definition of bevel gears with ability to miter gear increase or lower speed, miter gears do not have that ability due to the pair’s same amount of teeth. Their purpose is limited to the change in transmission direction. Because they are a kind of bevel gears, the essential characteristic of bevel gears exist such as presence of gear kinds 
of straight cut, spiral slice and types.
Also, since the shafts can be set to any angle, now there are miter gears with non-90 degree (non-perpendicular) angle called angular miter gears. Ever-power is capable of generating angular miter gears with shaft angles in the number of 45 to 120 degrees.
Because a couple of straight tooth miter gears has the same amount of teeth, with the exception of minor differences such as collection 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 number of teeth will be the same, the twisting directions will vary. Therefore, the same equipment can’t be meshed together, and it is required to pair the right and still left handed pairs.
Bevel gears are classified in different types according to geometry:
Straight bevel gears have conical pitch surface area and teeth are straight and tapering towards apex.