Reversible fully mounted plow with hydraulic operated working width The Vari Flex EX range from Överum represents the heavy duty class of fully mounted reversible ploughs for tractors up to 300 hp. The Vari Flex EX range consists of models from four to six furrows, with fully automatic hydraulic stone release system or fixed beams with shear bolts. The sturdy main frame on the EX has dimensions of 220 x 120 mm, suitable for a plough which is designed for tough ploughing conditions.