Size 1: For removing bulk, clipper over comb and fades; leaves hair 3/32" (2.4mm) Size 1.5: For clipper over comb and fades, use in middle of fade; leaves hair 5/32" (4.0mm) Size 2: For freehand and blending, use for the top part of a fade; leaves hair hair 1/4" (6.3mm) Size 000: For bald fades and flat tops, use for the bottom part of a fade; leaves hair 1/50" (1.2mm