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Signing UpStep 1What you need
D-Ring Carabiner (3-5 inch carabiners work best, bigger is better. They don't need to be "load bearing")
Hex Nut (large enough to slip into the carabiner and go all the way around. The flat sides need to be big enough to drill a 1/4in hole into)
Short Magnetic Bit Driver (The kind you'd use in a power drill)
You'll need the following tools
Hammer
1/4in Drill Bit
Center Punch
Square or Triangle needle file (must fit into a 1/4in hole)
J-B Weld (or what ever you prefer)
Drill or Drill Press (Not Pictured)
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http://www.instructables.com/id/Key_Ring_Hex_Bit/
It's already commercial, and has been for a few years, I think. Although, still a great idea, and well worth an instructable.