unit bearing fan motor can be used in automobile,precision machinery,electric tools, ... Gcr15, stainless steel 440c/420c/304c ID (inner diameter)/Bore: 1 mm - 40 mm;OD (outer diameter): 3 mm - 80 ... mm;Width/Height/Thickness: 1 mm - 19 mm;Precision Rating: ISO Class 6/ ABEC-3 ... Type: ZZ Sealed, 2RS Sealed or Open1- unit bearing fan motor :60,62,63 series with open,Z,ZZ,RS,2RS ...