Like what's been said a few times now size all depends on what your working on and the job.
For most automotive stuff 3/8 is the most common but get into something in bigger sizes or parts and you'll probably need 1/2. And for smaller stuff you'll need 1/4.
You mentioned sticking with deep 3/8 in one of your replies, for the most part shallow sockets will do the job and you'll hit places where deep won't fit.
If you're working on GM you'll more than likely need torx bits at some point. If you're working on any older stuff you'll need SAE sizes also.
If you're starting with noting look at getting a socket set that already has all the typical sizes. If you've already got some you might be better off waiting to buy more until you are actually planning on working on something and have a better idea of what you'll need.
For most automotive stuff 3/8 is the most common but get into something in bigger sizes or parts and you'll probably need 1/2. And for smaller stuff you'll need 1/4.
You mentioned sticking with deep 3/8 in one of your replies, for the most part shallow sockets will do the job and you'll hit places where deep won't fit.
If you're working on GM you'll more than likely need torx bits at some point. If you're working on any older stuff you'll need SAE sizes also.
If you're starting with noting look at getting a socket set that already has all the typical sizes. If you've already got some you might be better off waiting to buy more until you are actually planning on working on something and have a better idea of what you'll need.








