1. This is a set of 10 heavy duty tools to help remove nuts, bolts, screw heads, studs, etc.2. It fits heads of size 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19 mm3. Spiral cut teeth provide a positive grip for removing rounded or damaged bolts4. Made of hard alloy, they are of high strength and long durability5. These tools can be driven with a metric wrench or socket for quick work Specification: Features:This is a set of 10 heavy duty tools to help remove nuts, bolts, screw heads, studs, etc.It fits heads of size 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19 mm.The spiral cut teeth provide a positive grip for removing rounded or damaged bolts.Made of hard alloy, they are of high strength and long service life.These tools can be driven with a metric wrench or socket for quick work.All these tools are packed in a case for easy storage and transportation easy.Specifications:Material: AlloyColor: BlackFit Head Size: 9mm/0.35'', 10mm/0.39'', 11mm/0.43'', 12mm/0.47', 13mm/0.51'', 14mm/0.55'', 15mm/0.59'', 16mm/0.63'', 17mm/0.67'', 19mm/0.74Case Size: Approx. 17.2 x 7.9 x 3.5cm/6.77'' x 3.11'' x 1.37''Package Weight: Approx. 368gPackage Included:1 x 10pcs/set Nut Removal Kit