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Guide post sets and bushing for die set and mold use, also called the ball bearing components/guide pole set,guide pillar sets.Made of SUJ-2(guide bush/sleeve bushing);GCr15 AISI5200 (steel balls,and sphericity is 0.25μm);bushing of the ball retainer/cage made of POM/Polyoxymethylene(import from Taiwan or Zenite of USA 100P)) or Aluminum alloy(A6061) or copper alloy(59 brass). Key Specifications/Special Features: Materials: SUJ2; GCr15 AISI5200,POM/aluminum alloy/copper alloy. Hardness:HRC6062 High grinding- resistance and high precision, used in precise molds Can guarantee that precise molds have high guidance and position properties.