The BC21 Series from Bomar Crystal is a RF Quartz Crystal with Frequency 6 to 200 MHz, Frequency Stability ±50ppm, ±5ppm to ±100ppm, Frequency Tolerance ±30ppm(Standard), ±5ppm to ±100ppm(Available), Drive Power Level 1000 µW, Load Capacitance 10 to 100 pF. Tags: Thru Hole. More details for BC21 Series can be seen below.