1. Titanium Combination Drill taps are made of HSS 4341, which can , fast execution and retain strength and efficiency. The is treated with a titanium alloy, which greatly improves the cutting performance of the drill, is more wear- and prolongs the service life. 2. Titanium Combination Drill Tap Bit Set provides tapping, deburring and countersinking for a quick and complete job on copper, wood, brass, aluminum, sheet metal and plastic etc. 3. So it has high versatility. Each tap drill is engraved with a label, which is convenient to choose the size that suits you. The convenient ¼-inch (6.35mm) quick change hex shank has a tapered end to prevent excessive knocks. Back taper exceeds the tap to prevent over-drilling and damage to the thread. 4. Storage case is and for easy storage and is portable for all job environments This is a convenient hex shank tap drill set that can simultaneously complete hole drilling, tapping, deburring. It is not easy to shake and can drill accurately. Shank: 1/4 inch Hex Shank (quick change for cordless drill ) Application: Suitable for drilling, tapping, cutting on light metal, aluminum plate, iron, etc. Colour: gold+silver Material: high-speed steel Package Contents: 4 x M3 x 0.5mm x 64mm Drill Bit 2 x x 0.7mm x 65mm Drill Bit 2 x M5 x 0.8mm x 67mm Drill Bit 2 x M6 x 1.0mm x 67mm Drill Bit 2 x M8 x 1.25mm x 70mm Drill Bit 2 x M10 x 1.5mm x 70mm Drill Bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.