Hex keys and torn keys are used to turn bolts and screws with specialized sockets in the fastener head. A hex wrench or Allen wrench features a hexagonal shape and can be used with automotive, plumbing and electrical applications. Use ball-end hex keys at an angle off-axis to the screw. They’re designed to provide 360° rotation at angles up to 35°. Hex keys with T-shaped handles can provide increased turning power and more comfortable grips. Non-sparking, non-magnetic Allen wrenches can be useful in hazardous environments. Torx keys are used for fasteners having a head with a 6-point star or asterisk-shaped socket and are frequently used in computers and electronics. Hex key and torn key sets provide multiple head sizes so they can be used with a range of fasteners.