A Torx wrench is a wrench that is compatible with Torx screws, which have hexagonal star-shaped screw heads. Torx screws feature strong engagement between screwdriver and screw, enabling the screw to be turned stably. Shapes are T-type with a recess in the screw and E-type with a protrusion, and each uses its own dedicated wrench. They are used to prevent tampering as they cannot be used with cross-head / straight-slot screwdrivers, but tamper-proof screws with a protrusion at the center of the hexagonal star shape can only be used with a dedicated Torx wrench. Some products are easy to carry, being folding types with a variety of sizes combined in one or with a dedicated holder, are screwdriver types that make it easier to reach narrow parts, or are bit type for use attached to electric tools.