FLASHBULBS
(all types)

1. Screw base Flash bulbs are for Press Cameras.
These fit Graphic style large handle flashes.
These are also called household base.
2. M base Flash bulbs have a 9mm diameter base that
is 13mm long. These bulbs are mostly elongated in shape and are mostly not round.
3. Press Flash bulbs have a 15mm diameter base that is
20mm long. These bulbs are mostly round in shape.