Metal drill bit cylindrical shank DEXTER PRO L 49.0 mm Ø 2.0 mm, 2 piecesIdeal for efficient drilling of hard metals and technical steels such as stainless steelHis head has an angle of 135° that allows it to drill hard materials more efficiently. For optimal drilling, we recommend adjusting the rotation speed of your machine. In fact, for metal drills, the larger the diameter, the lower the drilling speed. You can refer to the value listed on the back of the product package. To preserve the drill bit and increase its life, it is essential to lubricate the metal drill bit regularly with cutting oil when drilling. Avoid using the percussion function of your machine/drill to avoid damaging the drill bit and the material being drilled.