This piezo igniter can be used for all sorts of applications where you need a spark to make fun things happen. With a large red button, easy mounting, and a long detachable ignition cable, this would be a perfect fit for your next spud cannon, rocket launcher, or flamethrower.

The igniter itself is about 88,9mm / 3.5" long, with a 16,51 mm / 0.65" diameter barrel (for mounting).
The cable is just over 60 cm / 2 feet in length.