This screw extractor is made of hardened carbon steel and are used expressly for removing broken or seized screws. Size #5, Material Carbon Steel, Finish Uncoated (Bright), Flute Length 1-1/2", Overall Length 3-3/8", Screw Size 9/16" - 3/4", Drill Size 17/64", Small End 1/4", Large End 7/16", Pipe Size 1/8" - 1/4" NPT