The DMCF21D002-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.39625 to 21.40375 MHz, Bandwidth 7.5 kHz, Center Frequency 21.4 MHz, Insertion Loss 3.5 dB, Rejection 45 dB@±8.75 kHz to 65 dB@±12.5 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DMCF21D002-21.40MHz can be seen below.