These black JIS spec M4x25 0.7 thread pitch screws and washers are used with Sansui 4-sided wood cases that have side mount screws. 4 sided cases have a bottom board that covers the bottom of the chassis.
These black JIS spec M4x25 0.7 thread pitch screws and washers are used with Sansui 4-sided wood cases that have side mount screws. 4 sided cases have a bottom board that covers the bottom of the chassis.