This size of needle is a 2.25mm. Some manufacturers call a 2.25mm a US#1, and others may already have a US#1, so will not give it a US size number. In this range of 2.25mm to 2.5mm, you will find a disagreement of US# designations. My advise is to look at the mm sizing and choose either what your stash at home is, or make your best guess. Honestly a .25mm difference is very minute.
This size of knitting needle is commonly used with Lace  and Fingering  weight yarns. Its' gauge generally runs between 8 to 10 stitches per inch. This can vary immensely with the particular characteristics of the yarn, and if the knitter is a tight or loose knitter.
Please enjoy our selection of one of the most commonly used sizes of knitting needles. Any questions? Free to call or text.
TIP: Sort into shade # order and the needles will sort by length.