addi Plastic crochet hooks are lightweight, easy to use, and come in the larger range of sizes. Available in: USJ (6.00mm), K (7.00mm), L (8.00mm), M (9.00mm), N (10.00mm), O (12.00mm), P (15.00mm) and S (20.00mm). Sizes are listed in approximate US sizes -AND- exact metric sizes for your convenience. All addi knitting needles are manufactured to exact metric sizes. Please Note: Every addi product purchased from an Authorized addi Dealer comes with a Lifetime Warranty from any manufacturer"s defect.