My Copper Cuff Bracelet blanks are:  Medium - 6", Large - 6 1/2", Extra Large - 7",  2XL - 7 1/2", 3XL - 8".

To Determine cuff Bracelet size, measure your wrist above or below that nobby jointy bone; wherever you want the bracelet to sit. Mine measures 6 1/4" and I wear a size medium cuff bracelet. My husband's wrist measures 7" and he wears a size XL.

A size Medium will fit up to a 6 1/2" wrist. 

A size Large will fit a wrist measurement of 6 1/2" to 7".

An extra large will fit a wrist measurement of 7" to 7 1/2".

A 2XL will fit a 7 1/2" to 7 3/4" wrist, and 3XL will fit 7 3/4 to 8".