"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Hex wrenches, also known as Allen keys, are the tools you use to screw and unscrew fasteners that have a ...

Furniture giant IKEA has a not-so-secret weapon at its disposal, and it’s not the Swedish meatballs. Inside virtually every ready-to-assemble product requiring screws is a complementary Allen wrench, ...