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The 8:1 planetary drive provides four full turns of the shaft from Maximum Capacitance to Minimum Capacitance.
The performance you want at a price you can afford.
The manufacture calls these capacitors 381pf, however my measurements show them to be 14pf to 400pf.
The envelope is approximately 1 3/8" Square.
Rated 350 Volts RMs
The 1/4 inch diameter shaft lets you use just about any knob you want.

The drawing below was Drawn by a Customer and furnished to Crystal Radio Supply to aid other builders.
Nice Job.

For easy capacitor mounting choose the mounting bracket option shown below.

Three bracket to capacitor screws are included.
Mounts to your surface with two # 6 holes. (Bracket to surface screws not included)
MOUNTS TO YOUR SURFACE WITH TWO # 6 HOLES. (Bracket to surface screws not included