B20-The Snap-on Tools 15mm Serpentine Belt Tensioner Tool Wrench YA9350 B1 is a high-quality hand tool designed for automotive use. Made by Blue Point, a reputable brand, this wrench is a single 15mm piece that is essential for tensioning serpentine belts. With a durable construction and a no warranty policy, this tool is a reliable choice for professionals and DIY auto enthusiasts alike.B20