Features: This is a set of 10 pieces sturdy tools to help remove nuts, bolts, screw heads, studs, etc. It fits heads sized 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19mm. Spiral cut teeth provide a positive grip to remove rounded or damaged bolts. Made of hard alloy, they are of strong strength and long durability. These tools can be driven with a metric spanner or socket for fast work. All these tools are packed in a case for easy storage and transportation. Specifications: Material: Alloy Color: Black Fit 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 / 0.74 Case Size: Approx. 17.2 x 7.9 x 3.5cm / 6.77'' x 3.11'' x 1.37'' Package Weight: Approx. 368g Package Included: 1 x 10Pcs/Set Nut Remover Kit 1This is a set of 10 pieces sturdy tools to help remove nuts, bolts, screw heads, studs, etc 2It fits heads sized 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19mm 3Spiral cut teeth provide a positive grip to remove rounded or damaged bolts 4Made of hard alloy, they are of strong strength and long durability 5These tools can be driven with a metric spanner or socket for fast work