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Bulldozer Bolt-on Hot Cup End Bit 8e4541HD 30mnb, Find Details and Price about Caterpillar Bolt-on End Bit and Caterpillar Bulldozer Spare Parts from Ningbo Refue Machinery Spare Parts Co., Ltd. Featuring Superior Wear Resistance: Boron steel offers twice the lifespan of carbon steel with higher hardness and abrasion resistance.