Description: Set Of 10 Pieces: bolt nut remover fits heads sized 9, 10, 11, 12, 13, 14, 15, 16, 17 and 19mm. Material: extractor made of hard alloy, high strength and long durability. Easy to Use: removal tools can be driven with a metric spanner or socket for fast work. Portable: Impact bolt and nut extractor tools comes with aluminum box, easy to carry Purpose: sturdy tools to help remove nuts, bolts, screw heads, studs, etc. Specification: Material: carbon steel Fit Head Size: 9mm / 0.35inches, 10mm / 0.39inches, 11mm / 0.43inches, 12mm / 0.47, 13mm / 0.51inches, 14mm / 0.55inches, 15mm / 0.59inches, 16mm / 0.63inches, 17mm / 0.67inches, 19mm / 0.74 Outside hex size: 16/16/19/19/22/22/25/25/27mm Size Chart: optional Large Box: 17cmx8.5cmx4.2cm/6.69inchx3.35inchx1.65inch Small Box: 17cmx8cmx3.5cm/6.69inchx3.15inchx1.38inch Package Includes: 10Pcs/Set Nut Remover Kit Note: Please allow slightly errors due to manual measurement and different monitors. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.