Vital Carry’s latest pen doesn’t just have a single bolt-action mechanism, it has three of them. The pen can accept three individual D1 refills, so you can write in black, red, or blue simply by clicking the right bolt. The back ends of each bolt are color-coded for ease of identification. Available in a variety of metals.
Canadian steel fabrication company Ironmen Industries created this unique metal rod that’s got two interwoven threads, allowing nuts with opposite threads to move in different directions. We’re not sure of the practical application but it sure would make an amazing fidget toy. Originally spotted by Stene Woodwork.