This is a set of 10 strong tools for removing nuts, screws, screw heads, bolts etc It fits head sizes of 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19 mm Spiral cut teeth provide a positive grip to remove rounded or damaged screws They are made of hard alloy and have strong strength and long durability. And all these tools are packed in a case for easy storage and transport. These tools can be powered with a metric wrench or socket for quick work, Weight: 1.34 Pounds, Manufacturer: Garsent