Allen/Torx Keys

A hex key, Allen key, or Allen wrench (also known by various other synonyms) is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive).

Torx developed in 1967 by Camcar Textron, is the trademark for a type of screw head characterized by a 6-point star-shaped pattern. People who are unfamiliar with the trademark generally use the term star, as in star screwdriver or star bits. The generic name is hexalobular internal driving feature (often abbreviated as 6lobe) and is standardized by the International Organization for Standardization as ISO 10664. Torx Plus is an improved profile.