Description of features PRECISELY POSITIONED LENGTH: This 3 - 15 mm hair cutter head positioning head comb is specially designed for Philips QC5510, QC5530, QC5550 and other models of hair cutters, which can precisely position the hair trimming length, so you can easily get the ideal hair style with different lengths such as 3mm, 5mm, 8mm, 10mm, 15mm, etc., to meet your diversified haircutting needs. HIGH QUALITY MATERIAL BUILDING: Made of high quality ABS material, it has good toughness and durability, not easy to break and can be used for a long time. Meanwhile, the material is safe and non-toxic, will not cause any harm to the skin, reliable to use. Convenient Installation and Removal: The unique design makes it very convenient to install and remove the positioning head comb and the barber head, no need any tools, easy to complete the installation with a press and a buckle; a light pull, can be removed for cleaning or replacement, so that your haircutting process is more efficient and convenient. COMFORTABLE HAIRCUTTING EXPERIENCE: The comb teeth of the positioning head comb are carefully designed with smooth and rounded edges, which won't scratch the scalp, and can bring users a comfortable experience during haircutting, reduce skin irritation, and can be used without worry even for sensitive skin. Description of Applicable Scenarios Daily family haircutting: Whether you are trimming your own hair, or helping your family members with their hair, this positioning head comb is a good helper for family haircutting. It allows you to easily trim hair of various lengths at home, saving time and money on trips to the hairdresser's, and enjoying a cosy family haircutting time. Professional Hairdresser's Aid: For professional hairdressers, when doing some basic length trimming for clients, this positioning head comb can improve the working efficiency and ensure the accuracy of the trimming length, especially for some clients who have higher requirements for hairstyling precision.