4 blade Standard hub plateStandard Hub SpacerClamping hardware – OS hubClamping hardware – HPL hubClamping hardware – Standard hubOS spacerClamping blockSpacer support plate1/4″ Faceplate RotaxSteel drive lugFaceplate SAE2 blade Standard hub3 Blade Standard hub2 blade HPL hub2 blade HP hub3 blade HP hub3 blade HPL hub4 blade OS hub