Features Practical Use: The remover tool can quickly extract bolts, nuts and screws that are damaged, peeled, rusted or frozen. Better Design: Clear female together with reverse spiral flutes can provide maximum gripping power for easier removal. 18Pcs in Pack: Including 1pc knockout pin, 1pc adapter and 16pcs screw extractor in different sizes to meet your needs. Good Material: Adopting high quality chrome vanadium steel material with high hardness, very durable for long term use. Easy Carrying: Comes with a light weight and a compact size, the storage box will largely simplifies the daily carrying. Specification: Item Type: Screw Extractor Material: Chrome Vanadium Steel Specifications: 1/4in-19mm Format: Metric and British System Package List:16 x Screw Extractor1 x Adapter1 x Knockout Pin1 x Storage Box Package List 16 x Screw Extractor 1 x Adapter 1 x Knockout Pin 1 x Storage Box