Product Description14-piece collet set: 2 collets (0.5mm, 1.0mm, 1.5mm, 2.5mm, 3.0mm); 2 copper drill bits; 2 arbors (2.35mm, 3.17mm); 2 hex keys. The copper material is stable and durable, making it the ideal accessory for electric micro drills. The collets can be used with a twist drill as a miniature hand drill for drilling ABS panels, aluminum panels, and cardboard.For small drills, it can be used to drill holes in printed circuit boards when connected to a motor to create a special miniature drill. Includes 2.35 mm and 3.17 mm copper drill files combined with drill bits: 0.5 mm, 1.0 mm, 1.5 mm, 2.5 mm, 3.0 mm. This 0.5 to 3 mm drill bit set is made of copper and has an excellent surface finish.It can be used with a twist drill as a miniature hand drill to drill holes in ABS panels, aluminum, and cardboard.Easy drilling of holes in ABS panels, wood, aluminum and cardboard. Adaptation bit size: approximately 0.5 mm - 3.0 mm Chuck size: 0.5mm, 1.0mm, 1.5mm, 2.5mm, 3.0mm Contents of delivery: 2 rods, 2 copper pegs, 1 copper file of 2.35 mm, 1 copper file of 3.17 mm, 2 mandrels of 0.5 mm, 2 drill bit holders of 1.0 mm, 2 drill bit holders of 1.5 mm, 2 drill bit holders of 2.5 mm, 2 drill bit holders of 3.0 mm.Notes1) Due to manual measurements, there may be an error of 1 to 2 mm.2) Due to differences in screen displays, the photos may not reflect the actual color of the item. Therefore, the color may be slightly different from the actual color. Please refer to the actual item.