While Arrow manufactures hypoid gears with offsets, a far more common style produced by Arrow is the spiral bevel gear - an Arrow Gear specialty. Spiral bevel gears are used to transmit power between shafts that are typically at a 90-degree orientation to each other. Spiral bevel gears, like other hypoid gears, are designed to be what is called either right or left handed. [Fig.1] A right hand spiral bevel gear is defined as having the outer half of a tooth curved in the clockwise direction at the midpoint of the tooth when it is viewed by looking at the face of the gear. For a left hand spiral bevel gear, the tooth curvature would be in a counterclockwise direction.