... U47, U82, U84, U92, U94 3.coal mining bits coal mining bitsPhysical Description: Forged Steel Body, made of 42CrMo ... is also available for very high performance.Process:According to the customersdrawings or samples.Item Material:Carbon Steel, ... line of tooling and accessories for Mining and Mineral ground tool,Foundation drilling,Horizontal directional drilling(HDD),Trenching,Hydraulic millingcutter ...