Material: Made from Chromium-Vanadium (Cr-V) steel for strength and durability. Sizes included: Set contains 5 extractors for screw sizes ranging from \(3\text{--}6\text{mm}\) to \(14\text{--}18\text{mm}\). Design: Reverse-spiral flutes grip screws firmly for controlled extraction. Storage: Comes in a compact plastic case for organization and storage.