Flat head screwdrivers were the original screwdriver, possibly being invented around 1460. They were the only type of screwdriver until the early 20th century.
Hex, or Allen screwdrivers are for screwing and unscrewing Allen head screws.
There are more than two types, but the main categories are flat head and cross/star screwdrivers. Actually, there are four: flathead or standard, phillips head, hex or Allen head, or Torx or star head. Torx/star head and Allen/hex head fasters are more often than not bolts, differentiated from screws, but there are a number of different styles of actual screws that are manufactured for these two bits as well.
The different sizes of Phillips head screwdrivers available are typically numbered from 0 to 4, with 0 being the smallest and 4 being the largest.
Phillips, or Phillips head, refers to the shape of the screwdriver's tip. It forms an X or a cross at the tip, instead of being straight as in a flat head. Phillips head screws and screwdrivers are less likely to slip while being turned, but it's more important to use the right size to avoid damaging the screw head.
Slotted Phillips (cross shape) Torx (star burst) Robertson (square peg) Reid and Prince (thinner than a phillips) Awl Head (hexagonal)
It's used to work with flat screws, which,frankly are really a pain. I'm so glad we now have Robertson and phillips screws.
Phillips, or Phillips head, refers to the shape of the screwdriver's tip. It forms an X or a cross at the tip, instead of being straight as in a flat head. Phillips head screws and screwdrivers are less likely to slip while being turned, but it's more important to use the right size to avoid damaging the screw head.
Screwdrivers are sized based on the width and shape of the screw head they are designed to fit. Factors that determine the size of a screwdriver include the type of screw head, the size of the screw, and the intended application.
Flat head syndrome does come with a high risk of learning delays and development. If not treated it can cause mental issues as an adult.
A turtle has a flat head so they can be hydrodynamic.
Craftsman,Stanley et cetera they all make a full range of Philips head drivers.
You need a monkey wrench, screwdrivers (flat and philips), as well as a hacksaw.