Multiripper Buckets UMR Series perfect to be coupled with excavators weighing 1.2 to 11 tons. Made of steel S355JR and HB 400, these buckets are particularly suitable to till very hard soils such as calcareous-marly, calcareous-sandy, calcareous-clayey (marlstone), and frozen soils, allowing operators to work in a quick and productive manner while reducing the strain on the excavator.