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.