The 20 Pcs Electric Fence Wire Tensioner is a handy tool for tightening cable in electric fences. Made of durable casting steel with a zinc finish, these round wire tensioners have a screw size of 2mm and a grip range of 2mm. The one-way drive style makes it easy to use, and the open end design allows for easy replacement when needed. With a compact size of 19.8 x 15 x 9.4 cm and a weight of 1.21 kg, this unit is designed for convenient use in various industrial and agricultural settings.