Dispersion: 180°
Back is round, not flat
1 or 10/Pack
Please choose your diameter from the drop down menu.

The 4mm size does come with a yellow (the yellow is used to create a scale ambient clear light) LED that can be powered with 6-12 volts.
Includes resistor for scale luminosity in 12 volt systems (to install the resistor, solder it into the positive side of the light as shown here) . The other sizes do not include bulbs but can be fitted with a clear bulb found here: CAPL24-6C

Here are the dimensions for the four available sizes, the "r" dimension is the bulb insert through the base of the fixture.

4mm Dimensions: R=5/32" (4mm) H=7/32" (5.7mm)

5mm Dimensions: R=3/16" (5mm) H=9/32" (7mm) r=1/8" (3.3mm)

7mm Dimensions: R=9/32" (7mm) H=11/32" (9mm) r=3/16" (4.5mm)

10mm Dimensions: R=3/8" (10mm) H=15/32" (12mm) r=1/4" (6mm)