The DEI4758-20.025MHz from Dynamic Engineers is a Band Pass Filter with Frequency 20.005 to 20.045 MHz, Bandwidth 40 kHz, Center Frequency 20.025 MHz, Insertion Loss 6 dB, Rejection 60 dB@±19.6 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI4758-20.025MHz can be seen below.