Premium Quality: Made Of High Hardness Chrome Molybdenum Steel For Long Service Life. It Is Sturdy More Durable And More Corrosion Resistant. Metric Sizes: 9Mm 10Mm 11Mm 12Mm 13Mm 14Mm 16Mm 17Mm And 19Mm. A€Precision Designa€‘ - Internal Thread With Reverse Spiral Grooves To Bite And Provide Maximum Grip The More You Twist The Tighter The Grip. Wide Application: Specially Hardened Sockets With Corrosion Protection Are Designed To Remove Damaged Bolts Screws And Nuts. Organized Storage: All Extractors Are Well Packed In A Sturdy Blow-Molded Box For Safe Storage And Easy Transportation.