Not only will the Jethro Tule loosen or tighten your 15mm axle nuts, it'll open a bottle of your favorite beverage too! Of course, it can't do either one without your help. Which is why you have to buy it first.
The spoon-shaped handle is comfortable in the grip and the 15mm socket head fits neatly inside hooded dropouts like the ones on your Surly Steamroller or many other fixed-gear/singlespeed bikes. The socket is slightly angled in both directions for an appropriate handle position when and solid leverage for tightening or loosening (lefty-loosey, ya know?). Forged steel construction is durable and confidence-inspiring. Just holding one of these in your hand will make you smarter and more attractive. Did we mention the other end takes the lid off bottles? It's called a bottle opener. There's also a hole for a loop of cord so you don't lose it.