This is a 20Mhz through-hole crystal oscillator. It's perfect use in a breadboard for doing you own AVR development.
To use this with an AVR chip, you also need a couple of 20-22nf capacitors. Luckily, we have those too.
List price: $0.75
Weight: 1 g
Dimensions: 10 mm × 3 mm × 3 mm