Witte pozidriv titanium coated bits have a narrow recessed section or waist called the flex zone this works on the torsion stick principle and will absorb sudden peaks in torque overload thereby increasing the working life of the bit the zone is sectioned for maximum durability it has a titanium nitride coating with a hardness in the range of 2800hv which is three times the hardness of an extra hard uncoated bit specificaion size 1pt length 25mm drive 14in hexagon supplied as a strip of 10