The DEI4759-20.05MHz from Dynamic Engineers is a Band Pass Filter with Frequency 20.0465 to 20.0535 MHz, Bandwidth 7 kHz, Center Frequency 20.05 MHz, Insertion Loss 4.5 dB, Rejection 60 dB@±33 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI4759-20.05MHz can be seen below.