This is a 10-piece heavy-duty tool set for removing nuts, bolts, screw heads, studs, etc. It fits 9, 10, 11, 12, 13, 14, 15, 16, 17, and 19mm heads Spiral-cut teeth provide a positive grip for removing rounded or damaged bolts Made of hard alloy, they are of high strength and long durability These tools can be driven with a metric wrench or socket for quick work Features: 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/Nut Remover Kit The size within 1-3cm size difference is within the normal range due to manual measurement. The color may have a little difference due to lights, screens.