For example, asking for a “Number 2 Haircut” means the #2 guard will be attached to the clipper to leave 1/4 inch of hair on the scalp. Similarly, a “Number 1 Haircut” is a very short cut that corresponds to a 1/8 inch length; a “Number 3 Haircut” cut to 3/8 inch; and a “Number 4” is the medium length of 1/2 inch.