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Caterpillar’s rock buckets are designed to work principally in mining and quarry industries, with either straight or spade edges. The straight edge has higher breakout force and increased dump clearance; the spade edge offers better penetration. The buckets have tapered sidewalls. The 148-6899 model has a 128-inch width, 4.5-cubic yard adapter capacity and 4.5-cubic yard boce capacity.