... 2.Specification: U47, U82, U84, U92, U94 3.coal mining bits coal mining bitsPhysical Description: Forged Steel Body, made of 42CrMo ... and accessories for Mining and Mineral ground tool,Foundation drilling,Horizontal directional drilling(HDD),Trenching,Hydraulic millingcutter,Tunnelling,Recycling,Forestmulching,Railtrackconstruction ...