40x152mm F/L x 298mm OAL 4MT T/S Armour Piercing Drill M10x25 ZP 10.9 torsion extension bars are for

torsion extension bars are for tightening only

Triple-riveted end hook

Colour code Brown

often known as joint-cutters or wad punches

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40x152mm F/L x 298mm OAL 4MT T/S Armour Piercing Drill M10x25 ZP 10.9 torsion extension bars are forUsed for heavy duty drilling in work Hardening steel with a manganese content of 12 14 percent . 4 Morse taper Overall length 298mm Flute length 152mm 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