This is a set of 10 pieces sturdy drive socket tools to help remove nuts, bolts, screw heads, studs, etc. 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. socket tools are made of hard alloy, strong strength and long durability. These tools can be driven with a metric spanner or socket for fast work. size:17.2 x 7.9 x 3.5cm Material:alloy colour:Black Package Contents: 10 x nut extractor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.