Made of high-speed steel, it can sharp and fast execution and maintain strength and efficiency. The surface is treated with titanium alloy, which greatly improves the cutting performance of the bit. Each tap bit is engraved with a label, which is convenient to choose the size that suits you. The convenient hexagonal handle has a tapered end to prevent excessive knocking. The reverse taper exceeds the tap, which can prevent the thread from being damaged by excessive drilling. They are taps with drilling function, which can drill, tap, deburr and countersink copper, brass, aluminum, metal plate and plastic simultaneously. Name:Hexagon handle composite tap set styles:B:Metric Titanium-&SAE Diamond Colour:As Shown Material:high speed steel Size:Storage box size:11.7x10.3x3.3cm. Package Contents: 1 * Hexagon handle composite tap set 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.