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Here's a short lesson on screw types. Not the one night only edition. If you're into home tinkering, you may have come across a screw with an odd shaped head. Chances are it has a hexagonal hole that can only be opened with an allen key. These "unusual" socket head cap screws are meant for the most demanding mechanical applications and temperatures. They also work well when you have limited space for assembly or disassembly because allen keys are smaller than traditional screw drivers or wrenches.

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