1Clear Scale: The metal screw extractor has high visibility laser etched scales for quick user identification and access.2Chrome Molybdenum Steel: The screw extractor is made of high hardness chromium molybdenum steel, which is wear resistant, non deformable and durable.3Hex Head: The screw extractor has a hex head designed primarily for applying maximum torsion using sockets and wrenches.4Left Spiral Design: The screw extractor’s left screw design provides extra gripping power and faster threading speed, making your work faster and easier.5Storage Box: The screw extractor set comes with a plastic case for storage, which is easy for you to access and not easy to lose.