MFM and MFB drum mowers fit walk-behind tractors from 5 to 18 Hp (from 4 to 14 kW). They are light and easy to be mounted by using customized joints for the application to the different walk-behind tractors. The compact design reduces possible bumps and makes this implement very easy to handle for a fast and accurate work in any conditions. The drums are equipped with swivel knifes that retract when an obstacle is met. The lower free disc allows the cutting disc to follow the contour of the ground, independent of the tractor axle.