Something to do with motorbikes? No, it's a multi-tool, with everything from pliers to a ruler in a single pocket-sized implement.

What's it got to do with leather? Nothing. Except that it was conceived by Tim Leatherman from Portland, Oregon, after a European backpacking trip in 1975.

What was his problem? Frustration with ordinary pocket knives - even the ones with built-in tools.

Why? Not strong or versatile enough - and nothing you can really get a grip with.

Hence the pliers? They're the heart of it: full-strength, stainless steel, needlenose jobs. It took him eight years and dozens of prototypes before he launched the Pocket Survival Tool.

And since then? Lots of different versions, many imitations and a steady growth of multitool sales. Even the makers of Swiss Army knives now do them.

The most popular Leatherman? The Wave. It's got the pliers, two knives, five screw drivers, and eight other fold-out features including the vital can opener.

Pricey though? £89.95. Cheapest is the Micra at £26.95, built round scissors. For stockists call 01539 721032.

What's the alternative? A full-sized tool kit; wrecking the cutlery on that loose screw.