Phillips Head Screwdriver
The Phillips head screwdriver was designed by Henry F Phillips and was patented in the 1930s, it was designed to provide better contact with the screwdriver than the original flathead Screwdriver.
The Phillips’ head was designed to improve contact and torque. Its “X” design means it won’t slip out of the X-slotted screw. Instead, it grips the screw firmly in the centre, provided it’s the suitable size for the screw.