Just got a set of Koken ZEAL hex bits in 3/8" drive. Sizes 3, 4, 5, 6, 7, 8, 10, and 12 mm. They came with a nice little Koken magnetic socket rail. What I particularly like about them is that the ends aren't as chamfered as most I've seen, which I figure means more positive engagement with the bolt, but possibly at the expense of ease of insertion. Available from Amazon Japan for a bit less than ¥6000 ($53).
View media item 86917
View media item 86917
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