Use this corner box on overhangs between 8" Gable x 12" Eave and 12" Gable x 16" Eave @ 4/12 pitch or less.
If Gable is 8" or less and Eave is 12" or less and pitch is 4/12 or less, use TCBS.
If Gable is more than 12" or Eave more than 16" or if pitch is more then 4/12, use TCBL.
If overhangs are between 8" Gable x 12" Eave and 12" Gable x 16" Eave but pitch is more than 4/12, use TCBL.