The DMCF21D011-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.39 to 21.41 MHz, Bandwidth 20 kHz, Center Frequency 21.4 MHz, Insertion Loss 3 dB, Rejection 45 dB@±24.5 kHz to 60 dB@±35 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DMCF21D011-21.40MHz can be seen below.