Standard (also known as flathead) & Philips. You use the type (there are many more) that match the slots in the screws that you are using.
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 two most common types of compressors are the positive-displacement and the velocity or dynamic.
The two types of law are common and statutory.
Many sizes of screwdrivers are included in a standard screwdriver set. The sizes range from half an inch up to two inches. One can buy individual screwdrivers as well.
The two types of law are common and statutory.
The two most common triads are the Major and the minor triad. The other two types of triads are diminished and augmented triads.
Common and Prefered
amoeba and paramecium are two common types of protozoan
Two types of nouns are common and proper nouns.
Two types of nouns are common and proper nouns.
Netgear and trendnet