French horn rotor #4. Note that #4 rotor on older model Holton horns had only 2 slots for either dominant F or Bb. Newer 'reversible' style has 4 slots for Bb/F.
Fits models:
Holton H109
Holton H177
Holton H178
Holton H179
Holton H180
Holton H181
Holton H277
Holton H278
Holton H279
Holton H280
Holton H281
Holton H378
Holton H379
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