This is a set for delicate hairpin lace with crochet cotton or thread. The loom is fixed at 2cm wide, and it about 11cm long. It's steel with a nickle plating. The 1.75mm included crochet hook is the perfect size for working hairpin lace on this loom.
Hairpin lace in crochet cotton is perfect for making doilies or jewellery. Clover Japan has released free patterns for stunning bracelets made with this loom, available on Ravelry.
This set incudes instructions (in Japanese) with diagrams, but I'd highly recommend checking out Youtube to find a tutorial because the movements required to use the loom are tricky to describe. Annie's Online also has a passable class that includes teaching simple and braided hairpin lace.