45-degree set creates single, bubble, and double flares on steel, stainless steel, and soft metal (copper, aluminum) brake lines, transmission cooler lines, and fuel lines. For 3/16-inch (4.75mm), 1/4-inch (6.35mm), 5/16-inch (8mm), and 3/8-inch tubing. This tool is designed to be mounted in a vise, and the T-handle screw clamp securely keeps the die and tubing in place, so you can create flares quickly and easily. When building car brake lines, the Professional Brake Flaring Tool Kit adds a flare (makes tubing wider) to brake line end for a leak-connection. Keep your brake flares and brake system safe and at optimal length with this highly precise and accurate flaring tool.