Specifications: This 0.5-3mm twist drill chuck set is made of copper with excellent workmanship. The collets can go with twist drills as a mini hand drill for ABS board, aluminum sheet, and paperboard drilling. Type: Drill Collet Material: Copper Color: Golden Quantity: 6 Pieces per Set Features: Excellent Workmanship, Durable, Useful, Drill Adapter Drill Collet Sizes: 0.5mm (0.02"), 1.0mm (0.04"), 1.5mm (0.06"), 2.5mm (0.10"), 3.0mm (0.12") (Approximate) Connector Hole Diameter: 2.35mm (0.09") (Approximate) Notes: Due to differences in lighting and screen settings, the item's color may vary slightly from the images. Please allow slight dimensional differences due to manual measurement variations. Package Includes: 1 x Axis 1 x Copper Cap 2 x Terminal Strands 1 x 0.5mm Drill Collet 1 x 1.0mm Drill Collet 1 x 1.5mm Drill Collet 1 x 2.5mm Drill Collet 1 x 3.0mm Drill Collet