The 78090K is a 9-millimeter High Speed Steel drill bit with cobalt (HSS-CO) construction, designed for use with metal. The bit features a grind blade manufactured by Proline, with a cutting diametrically across the flutes for efficient cutting of metal material. The robust construction of the bit makes it suitable for various tasks, such as drilling, reaming, extruding, boring, milling, and chamfering. The 8-spiral cut design provides the optimal helix angle, allowing you to perform various tasks with precision and accuracy. The bit is powered by an ergonomically designed variable speed motor offering higher RPM, along with more torque, and includes a reverse switch to ensure a smooth drilling operation.