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EF20 High Frequency Vertical Transformer BobbinThrough hole EF20 bobbin, 5+5 pins vertical EF20 coil bobbin. Pin pitch=3.81mm, Bobbin Size=22.0mmX13.9mmX19.8mm. Parallel distance=10.16mm. PA66/PET material EF20 coil former, we manufacture final transformers, custom design and OEM also acceptable.