The SW77 switch is compatible with some of the following tool models:
For Skil: HD5525 TYPE 2, HD5550 TYPE 1, HD5575 TYPE 2, HD5575 TYPE 1, HD5660 TYPE 1, 5825 TYPE 2, HD5657 TYPE 2, HD5657 TYPE 1, HD5660 TYPE 2, HD77 Type 17, HD77M, SHD77, SHD77M, HD77M-72, 5860, 5550, HD5860, HD77-72
For Bosch: B5610, 1658, 1678A, 1656,1677M, B5700, 1656, 1677MD, 1677MDT, 1677DC-100, 1677C-100, B5600, 1655
Common reasons for replacing a switch are:
The tool will not turn on.
The variable speed function and electric braking aren't working properly.