Simply use the saw side of the striker to scrape off magnesium then use the smooth side of the striker against the ferro rod to ignite a flame. Starts hundreds of fires and has a compact design making it a vital addition to any pack or gear for use during outdoor adventures. Striker and magbar/ferro rod are held together by a key chain and allows for storing in any pouch or pocket or clipping to any part of your gear. Specifications Size: 5.5 x 0.5 in. - SKU: PROCT73727.