steel bar spirit is our spirit,Honesty,Sureness,Pioneer,Innovative round steel bars Features:1) Diameter: 50,60mm2) Delivery condition: forged, annealed3) Surface: black / grinding / rough-turned4) shock loading Used for manufacturing hot-extrusion die and mandril by aluminium alloy sections,swage hammers, forging presses, forging machine, high modulus die under hightemperature round steel bar