Features: Screwdriver set provide a convenient 2 in 1 function for removing damaged or rusty screws and bolts as well as repairing threaded connections on pipe. This screw extractor set is selected from high carbon steel, which is rust-proof and corrosion-resistant. The extractor features double-headed designs of different size. The extraction and repair can meet different requirements and is widely used. The screw extractor have a square center section and comes with extension rod for leverage. Suitable for welding work and removing worn or damaged screws and bolts, the screwdriver set is essential tool for enthusiasts and professional. Specifications: Component:High Carbon Steel 1/2inch is suitable for pipe inner diameter: 11-18mm 3/4inch is suitable for pipe inner diameter: 16-23mm 1/2inch:Approx.98mm/3.85inch 3/4inch:Approx.103mm/4.05inch Package Includes: 2Pcs Screw Extractor note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.