The Centipede is the metric version of the Inchworm "ruler in the round". It is a functional keychain accessory that you'll use more times than you ever thought. The Centipede is a rod of 4.76 mm [3/16"] diameter 6Al-4V grade titanium with grooves cut at 2 mm increments up to 8 cm long. The outside surface is bead blasted to a uniform matte finish, and new grooves are then cut every centimeter for ease of reading.
Why would you carry a ruler on your keychain? The real question is why not? Think of the possibilities! Check your tyre tread depth
Check the width of a broken fan belt or hose for replacement
Checking screw lengths
Comparing different product sizes at the store
Visualizing the size of a product based on reading product size specifications
Comparing the physical size of a part with the product packaging specifications at the store (i.e. buying a replacement plumbing fitting)
Carry this gorgeous piece of titanium on your keychain and you are sure to get comments. Will they know what it is? See if they can figure it out!