12 size 13 inch brilliantknitting (br brand) bamboo tunisian afghan crochet hooks needles us size (d - n), metric size (3.25 mm - 10.0 mm) brilliantknitting (br) this set of crochet hoos is very nice. you will love it. 12 piece 13 inch bamboo tunisian afghan crochet hooks 3.25 mm - 10.0 mm us size 3 - 15 brand new. only the finest top quality material (the toughest part of six-year old winter bamboo grown in high mountains) is selected to make our crochet hooks. these crochet hooks are carbonized, which makes them stronger and mildewproof and gives them a lifelong quality assurance. carbonized crochet hooks are much more expensive than bleached or waxed ones. sizes are: metric and us sizes: 3.25 mm (us d/3); 3.5 mm (us e/4); 3.75 mm (us f/5); 4.00 mm (us g/6); 4.50 mm (us 7); 5.00 mm (us h/8); 5.50 mm (us i/9); 6.00 mm (us j/10); 6.50 mm (us k/10.5); 8.00 mm (us l/11); 9.00 mm (us m/13); 10.0 mm (us n/15)