With high hardness and durability, this screw extractor has a long service life. Its rod uses standard caliber, universal and easy to use. It is equipped with a storage box, which is easy to carry and store. Screw extractor is designed with serrated thread, which is used to remove broken pipes, head screws and threaded screws. It adopts square head design, which is more convenient to twist, and can be twisted by adjustable wrench. It is constructed of carbon steel material. There are 2 styles compatible you to choose from. Screw extractors is suitable compatible home, construction sites, industries, workshops, etc. Item Name: Screw Extractor Material: Carbon Steel Features: High Hardness, Durability, with Storage Box 6 Specifications: 4mm, 4.5mm, 6.5mm, 7.5mm, 11mm, 15mm, compatible 4-25mm Diameter Screws 8 Specifications: 4mm, 4.5mm, 6.5mm, 7.5mm, 11mm, 15mm, 19mm, 24mm, compatible 4-50mm Diameter Screws Size Details: Style 6pcs, L: 100mm/3.94", W: 75mm/2.95"(Approx.) Style 8pcs, L: 125mm/4.92", W: 115mm/4.53"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Style 6pcs: 6 x Screw Extractor or Style 8pcs: 8 x Screw Extractor