How are the models of HIWIN linear guide rails classified?

Classification of HIWIN linear guide rails:

HG - High assembly four row ball type

EG - Low assembly four row ball type

QH - Silent High Assembly Four Row Ball Type

QE - Silent Low Assembly Four Row Ball Type

RG - Heavy duty four row roller type

MG - Two row steel ball micro size

Linear guide rail and slider reference size:15, 20, 25, 30, 35

Linear guide rail installation hole type:

R lock type countersunk hole,

U enlarged hole locking countersunk hole

T-shaped locking threaded hole (e.g. 15 guide rails labeled as: - length of guide rail, - length of guide rail, - length of guide rail)