又搜索了一番。12 point其实又叫双6 point，一般是为了飞机和飞船用的。NND德国车
12 point的出现，主要是为了方便使用，和不容易滑扣，而并不是加大扭力耐受。
Easier to Position
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A 12-point socket has more points than the average socket, so there are more angles at which the socket will fit on a bolt's head. Not only does this make the process faster and easier, it is also more convenient
when turning bolts in hard-to-reach recesses.
More Flexible for Different Bolts
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Because it has more points, the bi-hex socket also has the advantage of being able to turn different types of bolts. These interior points feature many angles that make the bi-hex socket suitable for turning square, hex, octagonal, and other types of bolts.
Read more: What Are the Advantages of a 12-Point Socket? | eHow.com http://www.ehow.com/info_11416215_advantages-12point-socket.html#ixzz2F2X3zrnZ
