Features:*1. This 0.5-3mm twist drill chuck set is made of copper with excellent workmanship. *2. It is suitable for 0.5-3.0MM drill bit.*3. For small drills, after connecting with the motor, drill holes for the PCB circuit board with special micro drills.*4. It can be used for drilling holes such as ABS board, wood, sheet aluminum, cardboard, etc.Description:*1. Adapter Drill: 0.5mm-3.0mm*2. Material: Copper*3. Color: Gold*4. Copper Drill Folder Size: 2.35mm/ 3.17mmPackage includes:1x Small Wrench1x Copper Drill Folder1x 0.5mm Drill Collet1x 1.0mm Drill Collet1x 1.5mm Drill Collet1x 2.5mm Drill Collet1x 3.0mm Drill Collet