flail

A flail is an agricultural tool used for threshing, the process of separating grains from their husks. It is usually made from two or more large sticks attached by a short chain; one stick is held and swung, causing the other (the swipple) to strike a pile of grain, loosening the husks. The precise dimensions and shape of flails were determined by generations of farmers to suit the particular grain they were harvesting. For example, flails used by farmers in Quebec to process wheat were generally made from two pieces of wood, the handle being about 1.5 m (4.9 ft) long by 3 cm (1.2 in) in diameter, and the second stick being about 1 m (3.3 ft) long by about 3 cm (1.2 in) in diameter, with a slight taper towards the end. Flails for other grains, such as rice or spelt, would have had different dimensions. https://en.wikipedia.org/wiki/Flail