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EF20 Switching Transformer Double Slots BobbinEF20 two slots transformer bobbin. 4+4 pin horizontal EF20 coil former. Bobbin Size=20.8mmX20.7mmX14.5mm. Pin pitch=5.0mm, Parallel distance=15.0mm. China EF20 bobbin factory. We have various size bobbin tooling. We manufacture final transformer for customer.