These are miniature size variable capacitors, perfect for crystal radio projects. These are small plastic ( Poly ) variable capacitors with dual 0-335pf and 0-20pf sections. You can connect the 335pf and the 20pf sections together to make a 0-355pf variable capacitor if desired. Due to scarce supply, the physical appearance of these may vary, as well as the length of the shaft. The shaft is only about 1/4" long, but it has a tapped hole in the center to attach whatever type of knob or extension you like.
Limited quantities available. Package of one.
Variable Capacitor: $9.99