Specification:Removes screws& studs.Made of 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. Type: Screw ExtractorMaterial: Chrome Vanadium SteelFeatures: Easy to Store, Useful, Durable, PortableSize Details1: 4mm/0.16", Suitable Scope: 4mm-6mm/0.16"-0.24" (Approx.)2: 4.5mm/0.18", Suitable Scope: 6mm-8mm/0.24"-0.31" (Approx.)3: 6.5mm/0.26", Suitable Scope: 8mm-11mm/0.31"-0.43" (Approx.)4: 7.5mm/0.30", Suitable Scope: 11mm-14mm/0.43"-0.55" (Approx.)5: 11mm/0.43", Suitable Scope: 14mm-18mm/0.55"-0.71" (Approx.) Notes:Due to the light and screen setting difference, the items color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. Package Included:5 x Screw Extractors1 x Plastic Storage Case