2 1/2" overall. Delivers a dependable spark in the most adverse conditions even after being drenched by water. Removable side panel allows for simple flint bar replacement. Durable assembly provides 1,000's of lights. Easy one-hand operation. Handy built-in clip to safely and conveniently attach to key chains, zipper pulls, backpack straps, lanyards, etc. Lightweight. Weighs only 0.3 ounces (9.2 grams). Hang packaged.