Titanium Centipede EDC Keychain Tool by TEC Accessories The Centipede Ruler Is A Titanium Key Ring Accessory Can Be Used To Measure Small Objects Such As Your Tire Tread Depth Great For Job-Related Measurements Great For Job-Related Measurements Inchworm Ruler Is The Perfect Addition To Your Keychain 4.76 mm [3/16&#034;] diameter 6Al-4V grade titanium rod Grooves cut at 2 mm increments up to 8 cm long Bead blasted to a uniform matte finish New machined grooves cut every centimeter for ease of reading (1) Centipede (1) 8.6 mm diameter split ring (1) Snap clip for attachment to other items Packaged in a foam-lined case Diameter: 4.76 mm [3/16&#034;] Overall Length: 88 mm [3.46&#034;] Measuring length: 8 cm Weight: 6.5 grams [.23 oz] Check your tire tread depth Check the width of a broken fan belt or hose for replacement Checking nail and metric screw sizes and lengths Use as a scale for map reading Measure thickness of materials Comparing different product sizes at the store Job-related measurements 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)