Extra Long Drill Bit DORMER Long Series DRILL BITS A-110 (METRIC) - Niolin Industrial Supply HSS-E Cobalt Drill 8mm Made from premium High Speed Cobalt, the drills can be used to drill a number of materials including steels, stainless steel and aluminium. A977 Long Series (20xD) HSS Drill Bright finish - Prevent work piece material from sticking to the cutting edge Dormer 5973260 A977 Heavy Duty Premium Quick-Helix Extra Length Drill Premium HSS - E material - Can be used for drilling many materials including steels, aluminium, stainless steel Special Flute Design - Parabolic flute design enables drilling extra deep holes in one single pass DORMER Long Series DRILL BITS A-110 (METRIC) – Niolin Industrial Supply A977 extra long series PFX drill comes in metric diameters from 1., 50 mm to 14., 00 mm. The drills have a bright finish which helps stop work piece material from sticking to the cutting edge. The PFX series of drills have a specially designed parabolic flutes which eliminates the need to drill deep holes in short steps (pecking), so even extra deep holes can be drilled in a single pass.