13 Piece Twist Drill Bit Set - Suitable for drilling holes with wood, plastics, metals (thin aluminum plate or thin iron). Not suitable for walls, stainless steel etc. Diameter set of 13 drill bits - 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.2mm 3, 5mm, 4.0mm, 4.5mm, 4.8mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm. 6.35mm hex handle - Replace bit quickly and safely. completely safe. Compatible with bench drill, ordinary manual electric drill or other standard drill chucks. Smooth drilling: designed as 45outer edge angle angle, which can improve the processing performance when drilling the workpiece material. Threaded chip flutes can remove splinters and debris faster. MATERIAL: Spiral drill bits are made of high speed steel with titanium coating, provide heat resistance and long service life. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.