Men’s Neckline Shaving Guide - Hair Trimming Ruler for Barber Neck Shaping Ensure a perfectly straight neckline with this men’s neckline shaving guide. Designed for both personal and professional use, this tool helps you create clean, sharp lines when trimming neck hair. It’s easy to use and fits comfortably around the neck, making it an essential grooming tool for men who want a polished look.