The dynamic duo of Elliot and Chris Williamson, better known as Ferrum Forge, has earned a solid reputation for their large, aggressively styled custom knives—but the adept brothers have other tricks up their sleeves, too. Their latest? The RUK: a small keychain-ready utility blade for any light-duty task. Measuring 2.6 inches long and weighing just 1.2 ounces, the RUK is compact and out of the way. It features a slim body made from your choice of copper or brass, both of which will develop a natural patina over time. The spring-loaded blade is designed to retract automatically and stay put safely inside the body. To access it, just slide the stainless steel button forward as far as you need.