The DMCF21D008-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.3925 to 21.4075 MHz, Bandwidth 15 kHz, Center Frequency 21.4 MHz, Insertion Loss 2.5 dB, Rejection 45 dB@±17.5 kHz to 65 dB@±25 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DMCF21D008-21.40MHz can be seen below.