How are the types and specifications of screwdrivers?
A screwdriver is a tool for screwing a screw to hold it in place, usually with a thin wedge-shaped head that can be inserted into the slot, slot, or notch of the screw head. The main word (minus) and cross (plus two). There are also commonly used six corner screwdriver, including six corners and six corners outside two.
There are many types and specifications of screwdrivers, and in the trade they are basically distinguished according to the batch heads. The first batch has two dimensions. One is the metric, we often say that the unit is MM. For example the size of those upstairs. The other one is English, it is 1/4,3/16 inches, for example, the number is multiplied by 25 metric dimensions.
