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EF20 Switching Transoformer Horizontal BobbinCustomized EF20 transformer. 6+8 pin single slot EF20 horizontal coil former. Bobbin Size=24.6mmX20.8mmX16.0mm. Pin pitch=2.5mm, Parallel distance=20.0mm. China EF20 bobbin factory. We have various bobbin tooling. We manufacture final transformer for customer.