1. 
   Cro-hook
   The cro-hook, is a special double-ended crochet hook used to make double-sided crochet, which is a variation of Tunisian crochet. Because the hook has two ends, two colors of thread can be used simultaneously and freely interchanged. Crafts using a double-ended hook are commercially marketed as Cro...
   Found op http://en.wikipedia.org/wiki/Cro-hook
   
   
2. 
   Crochet hook
   A crochet hook (or crochet needle) is a type of needle with a hook at one end used to draw thread through knotted loops. Only one crochet hook is needed to make crochet stitches. The crochet hook`s earliest use appears to have been in the late 18th century or early 19th century. Typical materials f...
   Found op http://en.wikipedia.org/wiki/Crochet_hook
   
   

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