Bosch PointTeQ 4.2mm diameter HSS twist drill bits are presented in a pack of 10 pieces. This model is optimized for accurate and fast drilling in metallic materials — especially steel, alloyed and non-alloyed metals, as well as aluminum and some plastics. Thanks to the "PointTeQ" design of the tip, the risk of initial slippage is reduced, and the centering is ensured at a higher level. This allows for less heat build-up and better durability over long working periods. The spiral channels are coated with black oxide to speed up chip removal and optimize the work process. This pack — with 10 tips — is a convenient choice for professional craftsmen, assembly teams, and electro-mechanical workers working on metal frame structures. When using a drill, it is important to select the appropriate speed and torque, and use the correct mandrel (3-jaw or hex type). It is recommended to use protective equipment (eg, safety glasses, gloves) during work.