Shinobi-shuko were the climbing claws used by Ninja.  They were attached to the hands, requiring a great deal of strength and stamina.  They were known as shinobi ashiko  when attached to feet.
The Yoritomo family favored these items as they both assisted in keeping a sailor from falling overboard when worn on the feet, and a full set made scaling other vessels that much easier. The Unicorn wore a variant of the claws on their feet to aid in staying in their saddle as well as traversing rough terrain on foot. Hiruma and Daidoji scouts used them during their missions. 
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