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R32, T38, T45, T51, Gt60 Mf Extension Rod Rock Drilling Tool. High-quality forged alloy steel Made of premium alloy steel, great impact toughness and bending resistance for long-time rock drilling. Professional heat treatment Balanced hardness and inner toughness, resist fatigue fracture under continuous impact. Multiple thread specifications R32, R38, T38, T45, T51 available. Match shank adapter, drill bit for top hammer drilling.