CPC B25B 13/065 (2013.01) | 12 Claims |
1. A tool adapted to engage a head of a dodecagonal type fastener having a corner and a flank with a flank length, comprising:
a surface having a sidewall extending between first and second recesses, the sidewall includes substantially straight first and second portions respectively having substanitally equal first and second portion lengths, and the first and second portions extend to a third portion that is concave and disposed between the first and second portions, wherein the first and second portions are angularly disposed by about 130 to 140 degrees relative to each other, thereby creating a contact point substantially at the third portion that is adapted to engage the flank at a distance of about 75 to 90 percent of the flank length away from the corner.
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