Which tool is primarily used to achieve different lengths in haircuts with precision?

Shears are essential tools in haircutting that allow for precision and control when working with hair lengths. They are designed to cut hair straight across with accuracy, enabling the stylist to achieve varied lengths and maintain clean lines. Using shears, a stylist can create sharp edges and layer the hair effectively, which is crucial for many haircut styles.

While razors can also be used to create texture and softer lines, they do not offer the same level of precision for length adjustment as shears do. Clippers, on the other hand, are primarily used for cutting hair shorter, especially in styles that require uniform lengths or fading techniques, making them less versatile for detailed length work. Thinning shears serve a different purpose primarily aimed at removing bulk and creating softer edges rather than achieving precise length variation. Thus, shears stand out as the primary tool for achieving different lengths with precision in haircuts.