Extremely useful for marking stitch repeats, counting out decreases or increases, and counting stitches on a large cast on project by placing a marker every 10 stitches or so.
Small – fits up to US 4 (3.5mm)
Medium – fits up to US 8 (5mm)
Large- fits up to US 10.5 (6.5mm)
XL-fits up to US 15 (10mm)