This pick comes from a slim field — most of today's candidates are RC truck assembly montages, Shorts, or workshop b-roll with little instruction. SmartTools at least shows a complete scrap-to-tool fabrication sequence, which has real educational value if you're learning metalwork on a budget.

The build repurposes a discarded motorcycle sprocket — already hardened steel with precision-cut teeth — into a functional wrench. That's a smart material choice worth understanding on its own: sprockets are typically made from medium-carbon steel (often 1045 or similar), heat-treated for wear resistance, which makes them excellent stock for tools that need to resist deformation under torque.

Expect to see the usual scrap-metal-channel workflow: marking and layout, angle grinder cutting, drilling, shaping the jaw profile, and finishing. The interesting takeaways are less about copying the exact wrench and more about the general technique — how to identify scrap stock with useful properties, how to lay out a jaw to fit a specific fastener, and how to clean up grinder work into something that looks intentional.

Caveat: SmartTools-style channels lean heavily on satisfying visuals and rarely narrate their reasoning. Watch with the sound off and pay attention to the jig setups, grinder angles, and order of operations — that's where the real lessons live.