Feature:1. There are different sizes of holes on the storage box, suitable for different sizes of chucks.2. Reasonable space layout, easy to put drill bits and find tools you need, bring you convenience.3. Adopts high quality plastic material, safe and ecofriendly, stable and durable.4. Equipped with chuck of different specifications, good performance, meet your different needs.5. Keep your tools organized, a set of tools are available for use, help improve your working efficiency.Specification:Condition: 100% Brand NewItem Type: Drill Bit Collet Stoage KitMaterial: Plastic + High Speed SteelER11 Chuck Size: Approx. 1mm / 0.04in1.5mm / 0.06in2mm / 0.08in2.5mm / 0.1in3mm / 0.12in3.5mm / 0.14in4mm / 0.16in4.5mm / 0.18in5mm / 0.2in5.5mm / 0.22in6mm / 0.24in6.5mm / 0.26in7mm / 0.28in1/4in1/8inER20 Chuck Size: Approx. 1mm / 0.04in2mm / 0.08in3mm / 0.12in4mm / 0.16in5mm / 0.2in6mm / 0.24in7mm / 0.28in8mm / 0.31in9mm / 0.35in10mm / 0.39in11mm / 0.43in12mm / 0.47in13mm / 0.51in1/4in1/2in1/8in.Package List:1 x Storage Box16 x ER20 Chuck15 x ER11 Chuck31 x Chuck BarrelNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.