Description: Removes Screws & Studs. Made of carbon steel for longer life and durability. Anti-clockwise twist design. Plastic reusable carrying / storage case included. Designed to remove stubborn, rusted, stripped, screws or bolts, even factory installed carriage type bolts with no slots to remove from. Specification: Material: Carbon Steel Size: 4mm-6mm,6mm-8mm,8mm-11mm,11mm-14mm,14mm-18mm,18mm-25mm. Package Includes: 6pcs Screw Extractor Set (Includes a Plastic Storage Case)