Dormer Pramet R458 11.70 mm CARBIDE TIALN FORCE-X STEPPED SHANK SHORT SERIES (X3D) DRILL DIN 6537 K140 degree 4 facet split point helps with self centering and reduces the push force required; Titanium Aluminium Nitride coating increases service life of the drill, improved performance when drilling harder materials; Special flute design ctw flute design provides increased strength and allow the drill to operate at higher cutting speeds and feeds; Premium carbide material can be used for drilling many materials including steel, aluminium, stainless