adapter sleeve specification:H23, H30,H31,H32series material:bearing steel,GCR15 ... precision:ABEC-1 product detail description: Model No. H seriesCategory Adapter SleeveSpecification 36*40*58mmMaterial TypeBearing steel, Carbon steelNumber of RowSingle ... inspection 7.Appearance inspection 8.Rust prevention 9.Product packaging Adapter sleeve H series