Hexagon socket head cap screws are tightened with Allen screws. You can recognize the classic version by its typical right-angle curvature, but you can also find Allen screwdrivers or plug-in bits.
Set of 9 HEX Allen Keys with Ball-End: 1,5; 2; 2,5; 3; 4; 5; 6; 8; 10MM
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