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Caterpillar’s stone sieve buckets are designed for excavation, hauling and removal of paving and masonry stones. The square-ribbed design allows the machine to sift fine materials. There is 70 millimeters of space between each rib, and the ribs are reinforced along the back. The 148 model has a 0.9-cubic yard capacity, 74-inch width and 935-pound weight.