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| From top to bottom: Fine steel hook, medium aluminum hook, large plastic hook. |
Crochet hooks come in a wide variety of sizes, ranging from less than a millimeter in diameter to
almost two centimeters thick.
The smallest hooks are made from steel and are used with fine threads to make delicate laces.
These hooks are sized 00-14, with 00 being the thickest at 2.70 mm and 14 being the finest at 0.80
mm.
The medium-sized hooks, which are used for the majority of yarn crochet projects, are usually made
from aluminum but can also be found in plastic or wooden varieties. They are assigned both a letter
size (A-K) and a number size (0-10½), and range in diameter from 2.0 mm to 6.5 mm. The exception
to the letter size system is the number 7 hook (4.5 mm), which does not have a corresponding letter.
The largest hooks are plastic and can be used with thick yarns or strips of fabric to make bulkier
projects. They are sizes L-S (8.0-19.0 mm), and may or may not have a number size in addition to
the letter size.
Although the Craft Yarn Council of America has attempted to standardize the sizing system for crochet
hooks, some discrepancies may still be found between the letter and number size systems. To
ensure accuracy when following a pattern, it is always best to reference the millimeter size of the
hook.
almost two centimeters thick.
The smallest hooks are made from steel and are used with fine threads to make delicate laces.
These hooks are sized 00-14, with 00 being the thickest at 2.70 mm and 14 being the finest at 0.80
mm.
The medium-sized hooks, which are used for the majority of yarn crochet projects, are usually made
from aluminum but can also be found in plastic or wooden varieties. They are assigned both a letter
size (A-K) and a number size (0-10½), and range in diameter from 2.0 mm to 6.5 mm. The exception
to the letter size system is the number 7 hook (4.5 mm), which does not have a corresponding letter.
The largest hooks are plastic and can be used with thick yarns or strips of fabric to make bulkier
projects. They are sizes L-S (8.0-19.0 mm), and may or may not have a number size in addition to
the letter size.
Although the Craft Yarn Council of America has attempted to standardize the sizing system for crochet
hooks, some discrepancies may still be found between the letter and number size systems. To
ensure accuracy when following a pattern, it is always best to reference the millimeter size of the
hook.
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