12x81mm F/L x 179mm OAL 2MT T/S Armour Piercing Drill PAIS-2.5DG because they are precision ground

because they are precision ground and made of premium high speed steel

drop forged from carbon steel raised panel design with polished heads

Most Non-Ferrous Alloys

while the hardened and tempered blades offer optimum strength and endurance

5 x 60 Metric Coarse Hex Set Screws 5 Pieces Zinc Plated Class 8

12x81mm F/L x 179mm OAL 2MT T/S Armour Piercing Drill PAIS-2.5DG because they are precision groundUsed for heavy duty drilling in work Hardening steel with a manganese content of 12 14 percent . 2 Morse taper Overall length 179mm Flute length 81mm Operating Conditions cutting speed between 3 4 meters per minute a feed of only 60 percent of standard drill Very rigid machine set up drilled without coolant Precautions drill must not touch work without feed being engaged no marking of work surface ie centre punch