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Pellet Mill Parts Spares Ring Die Roller Shell for Wood/Feet/Biomass Pellet Machine. Premium Alloy Steel Material: Core material is Premium Alloy Steel X46Cr13 / 4Cr13 for high hardness and wear resistance. Full Customization Support: Customizable hole pattern, thickness, relief holes, dimensions, and compression ratio. Long Service Life: Proven service life ranges from 800 to 2,000 hours depending on raw material. Advanced Heat Treatment: Vacuum quenching and tempering ensure uniform hardness distribution of HRC 52-58. High Precision Manufacturing: 8-axis CNC gun drilling ensures hole diameter precision from 1.0mm to 12.0mm. Mirror Polished Finish: Hole internal finish is mirror polished (Ra 0.8) for smooth discharge and zero break-in.