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 eco‑friendly, 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 New Item Type: Drill Bit Collet Stoage Kit Material: Plastic + High Speed Steel ER11 Chuck Size: Approx. 1mm / 0.04in 1.5mm / 0.06in 2mm / 0.08in 2.5mm / 0.1in 3mm / 0.12in 3.5mm / 0.14in 4mm / 0.16in 4.5mm / 0.18in 5mm / 0.2in 5.5mm / 0.22in 6mm / 0.24in 6.5mm / 0.26in 7mm / 0.28in 1/4in 1/8in ER20 Chuck Size: Approx. 1mm / 0.04in 2mm / 0.08in 3mm / 0.12in 4mm / 0.16in 5mm / 0.2in 6mm / 0.24in 7mm / 0.28in 8mm / 0.31in 9mm / 0.35in 10mm / 0.39in 11mm / 0.43in 12mm / 0.47in 13mm / 0.51in 1/4in 1/2in 1/8in. Package List: 1 x Storage Box16 x ER20 Chuck15 x ER11 Chuck31 x Chuck Barrel Note: 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.