Bevel gears, also known as conical gears, are commonly used for transmitting motion between two perpendicular shafts, but they also accommodate the transmission between shafts at other angles. A typical application involves using a horizontal drive unit to power a vertical pump. The two main distinctions between bevel gears and spur gears are their shape and their relationship to the shafts. Bevel gears are shaped like cones, whereas spur gears are originally cylindrical. Bevel gears transmit motion between two angled shafts, or intersecting shafts, while spur gears transmit motion between two parallel shafts.