CooBigo Survival Drilled Ferrocerium Flint Fire Starter Rod Kit With Keychain Ring Product Type:Fire Starter Lighter Material:Flint (magnesium) Rod Length*Rod Diameter:2-1/2"(63.5mm)*1/4"(6mm),3-5/32"(80mm)*5/16"(8mm),3-5/16"(100mm),3/8"(10mm),5"(127mm)*1/2"(12.7mm) Outside Diameter,Inside Diameter:3/4"(20mm),11/16"(17.3mm),1-7/64"(28mm),59/64"(23.4mm),1-3/16"(30mm),1"(25mm),6"(150mm) Split Ring Thickness:1/16"(1.5mm),5/64"(2mm),5/64"(2mm),1/16"(1.5mm)