Hole saws diameters per usage: General use: 16-17-22-29-35-51-54-127 Maintenance: 16-21-25-40-51 Electrician: 22-29-35-44-51-65 Maintenance electrician: 19-22-29-35-38-44-51-57-65 Steel construction: 21-35-38-54-60 Heat plumper: 19-29-35-40-44-51 Plumper: 19-22-29-38-44-57 Maintenance facility: 22-29-35-44-51