Extra long twist drill cyl. Shank, HSS steel extra long, Co5, rubberised, solid ATN n n finish surface & # x202 F: DIN 1869 ruko profile, right-hand cutting, precise conical tip and adjustable flutes with strong back rounded edges. Individual angle cross ground according to DIN 1412, shape A side melamine resin coated thickness kernel larger than normal, much more force than usual and without increasing nuclear energy. Application & # x202 F: Extra deep for drilling hole up to 10 x D in difficult conditions such as less easily free and therefore from poor cooling of the tip of the Especially for ultra deep drilling made of cast iron grey and steel up to 1000 N/mm² resistance without driver, plug and play exception & # x202 F: CrNi steels, steel stainless steel.