Micro Trenching Buckets UBF Series perfect to be coupled with excavators weighing 1.2 to 10 tons. Also known as Fiber Optic Buckets, they are specifically designed to remove the debris produced during the creation of trenches using a wheel excavator. The buckets of the UBF series are ideal to clean deep and narrow ditches, for example for laying electric or fiber optic cables, or installing gutters and drainage or irrigation pipes. The plates and bushings of every model are made in steel HB 400 and S355JR, whereas the welded blade is in ESTRONG® 250.