A hex key or Allen key 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).
Long Arm Hex Key Set offers the most common Inch and Metric hex wrench sizes to remove and install most socket cap screws found in robotics, diy kits, cars, furniture, equipment and more. The versatile long arm/short arm design offers extra reach on one end and extra leverage on the other. Made from heat treated chrome vanadium steel, these wrenches will deliver years of consistent performance. Precisely-sized ends are chamfered to slide easily into fastener, reducing wear on the wrench and damage to fastener head. The unique hinged storage case opens flat, making it easier to get wrenches in and out and is color coded so you always know which set to choose. And don't worry, hex keys are always guaranteed. So, go ahead, Take It On.
The versatile long arm/short arm design offers extra reach on one end, and extra leverage on the other.
Material: Alloy Steel
Surface Finish: Black Oxide
The tool is simple, small and light
The contact surfaces of the screw or bolt are protected from external damage
There are six contact surfaces between bolt and driver
The tool can be used with a headless screw
The screw can be inserted into its hole using the key
Torque is constrained by the length and thickness of the key
Very small bolt heads can be accommodated
The tool can be manufactured very cheaply, so one is often included with products requiring end-user assembly
Either end of the tool can be used to take advantage of reach or torque
The tool is L-shaped
The tool can be reconditioned using an electric grinder by removing the worn-out part, and then it works like new
The hexagon is typically a smaller diameter than would be used with an external cap, and is more likely to round off its contact surfaces.
It is much more difficult to turn a damaged (rounded or otherwise) internal fastener than an external one.