Massdrop x Ferrum Forge Retracting Utility Knifesearch
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Massdrop x Ferrum Forge Retracting Utility Knife

Massdrop x Ferrum Forge Retracting Utility Knife

(71 reviews)
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A Keychain-Ready Sidekick in Brass or Copper

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.

Note: This item is in stock and will ship within 1 business day with standard shipping. Your payment method will be charged 2 hours after joining. Cancellations are accepted until that time. The drop will launch and end each day to collect purchases.

At checkout, choose between brass and copper. You can also add a matching lanyard bead for (+ $10).

Office-Friendly Design With a Sure Grip

Don’t have room for a folding knife in your daily carry? Need a secondary edge for smaller cutting tasks? Want an office-friendly tool that won’t raise eyebrows every time you take it out? The RUK covers all the bases. Milled with a textured case back and finger groove, it’s designed for a secure grip. The domed button slides easily on the track when you're ready to put the RUK to work, but it won't catch easily on your pocket. Among the tool’s many uses are opening packages and letters, cutting threads, crafting, and scoring paper, plastic, and cardboard. Carry one every day and you’ll find plenty more.

About Ferrum Forge

Founded in 2009, Ferrum Forge started from humble beginnings in Elliot Williamson’s garage in Southern California. Using found pieces of steel like old files and leaf springs, Elliot gradually taught himself the art of knifemaking and metallurgy. As his skills and passion grew, so too did the demand for his work. Luckily, Elliot’s brother Chris joined the team in 2012 to help expand Ferrum Forge to what it is today: a small operation dedicated to designing and producing custom knives through a rigorous process of development, machining, iteration, and quality control.

About WE Knife

Since its founding in 2000, WE Knife has set a new standard for manufacturing in China. With a professional research and development team, high-quality facilities, and a commitment to precision manufacturing techniques, the company produces a wide range of cutlery manufactured to the highest tolerances.


  • Produced by Massdrop
  • Designed by Ferrum Forge
  • Manufactured by WE Knife
  • Country of origin: China (body), USA (blade only)
  • Material: Brass or copper
  • Compatible with #11 hobby blade
  • Stainless steel button screw
  • Stainless steel carriage
  • Stainless steel extension spring
  • Closed length: 2.6 in (6.6 cm)
  • Open length: 3.5 in (8.9 cm)
  • Weight, brass: 1.1 oz (32 g)
  • Weight, copper: 1.2 oz (34 g)


  • #11 hobby blade (1)
  • Extra pair of case screws (2)
  • Extra button piece (1)
  • Instructions for safe blade changing


All orders will be shipped by Massdrop.

Estimated ship date is Dec 17, 2018 PT.

Your payment method will be charged 2 hours after purchase. Cancellations are accepted until that time, after which the request will be submitted to vendors to deliver the best delivery time to members, making all sales final. Be sure to check the discussion page for updates.