Used for horizontal transfering of the granuled and dusty materials. Two different spiral sheets are used according to using purposes : If it is only for transferring, full spirals are used. But, if various types of wheat are to be mixed and trasferred in spiral, butterfly spiral sheets are used. The transfer period of the product from one end to another can be changed by adjusting the angles of butterfly spiral sheets. Spiral sheets are fitted into beds at the both ends of U-shaped main body.