1. Titanium Combination Drill taps are made of HSS 4341, which can sharp, fast execution and retain strength and efficiency. The surface is treated with a titanium alloy, which greatly improves the cutting performance of the drill, is more wear-resistant 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, , aluminum, metal and plastic etc. 3. So it has high versatility. Each tap drill is with a label, which is convenient for you to the size suits you. The convenient -inch (6.35mm) quick change hex has a tapered end to prevent excessive knocks. Back taper exceeds the tap to prevent over-drilling and damage to the thread. 4. case is lightweight and durable for easy and is portable for all job environments This is a convenient hex tap drill set can simultaneously complete hole drilling, tapping, deburring. It is not easy to shake and can drill accurately. : 1/4 inch Hex (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: 2 x x 0.5mm x 64mm Drill Bit 1 x x 0.7mm x 65mm Drill Bit 1 x M5 x 0.8mm x 67mm Drill Bit 1 x M6 x 1.0mm x 67mm Drill Bit 1 x M8 x 1.25mm x 70mm Drill Bit 1 x M10 x 1.5mm x 70mm Drill Bit Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.