HSS-G extended metal drill 8.0 x 390 mm, White 53980. The drill is made of high-speed steel 4241 with a hardness of 62 HRc and a tip angle of 118 degrees. Diameter: 8 mm, total length: 390 mm. Straight cut without chamfer correction, suitable for manual sharpening, N-type spiral right-hand thread. The cylindrical shank corresponds to the diameter of the drill. The surface of the drill is coated with an oxide layer that ensures a low coefficient of friction and enhances drilling performance. Complies with DIN 1869 II. For use with coolant. Recommended coolants: drilling emulsion, cutting oil, ester oil. The use of coolant extends the life of the drill by four times. Designed for use in workshops with alloyed and carbon steel with a strength of up to 900 N/mm², gray and ductile cast iron, non-hardenable iron metals, and hardened plastics.