This is a beautifully finished all purpose tool for the track racer, made in Japan for the Keirin racing market.
The hook end is both a lock-ring wrench and a "chainless chain whip" (the sprocket fits into the groove.)
The box end has a sturdy 15 mm box for axle nuts, and a 10 mm box on the end for "banjo bolt" type chain tensioners, if you use them.
At a hefty 320 grams and 220 mm overall length, this is not intended for "on the road" use, but it's a beautiful tool for trackside or for the home mechanic.
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