bayite Small Ferro Rod Survival Drilled Flint Fire Starter with Toggle Hole for Paracord Bracelet Necklace 1 Inch Pack of 6 Fasten this fire starter toggle to your gear, clothing, shoelace, keychains, custom paracord creations. This ferrocerium rod toggle not only cinch up your gear, they produce fire - whenever and wherever you need it. Don't use bad quality Knife as striker. Otherwise it will not produce enough sparks due to insufficient hardness of blade Diameter: 5/16inch(8mm). Length: 1 inch Hole diameter: 4mm. DIY your own survival kit