Features: brand new and high quality Suitable for low hardness materials such as wood, aluminium plate, plastic, or sheet iron (thickness of less than 3mm). Made of high quality HSS ; Suitable for tapping on wood, plank, plastic etc. Work slowly and carefully with these bits when drilling metal. Wide spiral flutes carry the chips out of the hole. Can be used on multi-spindle heads with reversing mechanisms for tapping in most materials. Taps with drilling function, used to drill a hole and cut new threads at the same for time, you will have a smooth tapping experience with them. Quick change 1/4” inch hex shank. Can be used with power tools, electric drill, group general tools, air and other any standard bit holders.1/4 inch hex shank fits into power tools more easily and securely. Specifications: Material:High Speed Steel Color:Silver Length:7.3cm/2.87inches Type:Silver Imperial/for Titanium Plating/Silver Metric Package Includes: 6 Pieces HSS Spiral Tap Drill Bits/Set note: Please allow 1-5mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.