Fading Haircut with Clipper Attachments
What size of clipper attachments do I use to fade in a zero or less?
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It all depends on how long or short your hair is to begin with and how short you want it to be! You didn't give me enough information to be able to answer your question with any detail but here are the guidelines.
Clipper attachments go from lowest number to highest number and that # corresponds to the length. In other words, number one would be the lowest # clipper attachment and the shortest length. A number two would be a little longer than one, but still relatively short and so on. 'Zero' implies that you have no clipper attachment and are holding the clippers directly on your scalp. You'd be shaving your head.
The length and # is clearly written on most clipper attachments. The length is usually given in inches and/or millimeters.
To fade out a haircut with clipper attachments, you simply start with a higher number clipper attachment, then work in sections through your hair into lower and lower numbered attachments. What number you start with or end up with is totally dependent on what style you desire and the initial length of your hair.