[DURABLE] The short bits are constructed of M35 Cobalt steel for fast cutting against tough wood material. [PRECISE] delivers precise accuracy when drilling through surfaces. [Multi- Use] Suitable for drilling stainless steel and various hardened metals such as cast iron, titanium, bronze, aluminium, etc. [Efficient Design] perfect self-centering and fast drilling Colour:As Shown Material:high speed steel Size:2.38mm, 3.17mm, 4.76mm, 6.35mm, 7.92mm Package Contents: 1 x 2.38mm Drill Bit 1 x 3.17mm Drill Bit 1 x 4.76mm Drill Bit 1 x 6.35mm Drill Bit 1 x 7.92mm Drill Bit 1 x blue 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.