PurposeImproving the precisions and control for even better and consistent cuts, the Wahl 3390 Stainless Steel Comb Guide Set No.1-8 lets you cut hair like the best barbers in the World. Each guide contains 9 teeth for even hair separation and are colour-coded for the easiest distinction and storage in the accompanying numbered caddy. Guides Included:No.1 – 3mmNo.2 – 6mmNo.3 – 10mmNo.4 – 13mmNo.5 – 16mmNo.6 – 19mmNo.7 – 22mmNo.8 – 25mmWhy it worksThe Wahl 3390 Stainless Steel Comb Guide Set No.1-8 have been designed for a variety of taper blades including all Wahl Competition Series models, the Stinger and Predator, as well as multiple Oster and Andis blades. Eight sturdy stainless steel combs provide precise trimming from lengths between 1/8th and one inch.