They are of two types according to their application: keystone and cabinet. These were invented in 19th century by Henry Phillips with an aim to introduce the power driven screwdrivers in most of the industries. When you see these screwdrivers from the front, the tip looks like a cross sign. These types of screwdrivers also shows cam- out effect but it does purposely when the torque exceeds a limit while tightening up of screw which resist the damage of screwdriver profile and screw and clearly extends the life of the tool.
The pozidriv screwdriver, unlike Phillips screwdriver, has two cross sign which are offset at 45 degree angles. These are designed and widely used in Europe. The engagement of quite tapered square shape opening screw with the square protrusion, with no angle involved, neglects the cam-out effect, thus improve centering.
Slight Taper shape at the front of the tool provides a good locking with the screw and thus makes it more comfortable for use. These screwdrivers types were first used for industrial purpose by ford motor company, because these drivers speed up the production, reduce damages, and highly reliable. Torx screwdriver is becoming very common and often used by automotive technicians.
Many times they are called as star tips by technician. For over 25 years, Megapro has designed and produced screwdrivers for tradespeople in multiple industry segments. The Megapro values; hard work, attention to detail, North American-made quality products, continue to be the foundation of the brand. The Megapro company, which started in a home basement, was inspired by Megapro Inventor, Hermann Fruhm, during a home renovation project.
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