Everyone needs a bottle opener, and our newest bottle opener is also a keychain! Constructed of spent brass, the 7.62mm bullet bottle opener is a must-have for all. This keychain bottle opener is100% made and sourced in the USAfrom a once-fired 7.62mm (.308 caliber) brass casing and a demilitarized projectile. While our .50 Caliber Bottle Openers and 20mm Bottle Openers give you a little more leverage on bottle caps, it's hard to top the convenience factor of having one of these on your keyring at all times. At just over 1oz in weight, about 3 inches in length, and a half-inch in diameter at its widest, you'll barely notice it alongside the rest of your keys.