This is a set of 10 heavy duty tool heads to help remove nuts, bolts, screws, nails etcIt fits head sizes 9, 10, 11, 12, 13, 14 , 15, 16, 17 and 19mmSpiral cut teeth provide a positive grip for removing rounded or damaged boltsMade of hard alloy, they are of strong strength and long life.These tools can be ordered with a socket wrench measurement or for a quick jobFeatures:This is a set of 10 heavy duty tool heads to help remove nuts, bolts, screws, nails, etc. It fits head sizes 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19mm. Spiral cut teeth provide a positive grip for removing rounded or damaged bolts. Made of hard alloy, they are of strong strength and long service life. These tools can be ordered with a socket wrench measurement or for quick work. All of these tools are packed in a case for easy storage and transportation.Specification:Material: AlloyColor: BlackFit head size: 9mm/0.9cm, 10mm/1cm, 11mm/1.1cm, 12mm/0.47, 13mm/1.3cm, 14mm/1.4cm, 15mm/1, 5cm, 16mm/1.6cm, 17mm/1.7cm, 19mm/0.74Case Size: Approx. 17.2 x 7.9 x 3.5cm/ 6.9 x 3.1 x 1.4inchPackage weight: about 368gPackage content:1 x 10pcs/lot Nut Remover Kit