X-Cords Fire starter whistle buckle combination. This is the ultimate survival buckle. Hidden with in the buckle itself is a flint and on the other side of the buckle is the striker. Buckle is side release style and also has the whistle built in. Must have survival gear. If you lose every thing this will be on your wrist. Awesome product. Includes X-Cords Exclusive Video Tutorial On How TO Make the King Cobra Paracord Bracelet With The Buckle. Buckle is best fitted for larger wrist size. Other applications our customers have noted are using it for a belt buckle. Will fit 3/4″ webbing and X-Cords Paracord 850 with the 8 inner strands.