When I started I bought every kind I could find. Socket and hex. Long and short. Don't waste your time with cheep ones. I found that the most important thing is to clean out the socket as best as possible. A sharp scribe and a stainless brush on a dremel work good for me. The hex ones work good in a cordless impact or an air hammer with the cool hex attachment handle thingy. You can buy any handle to put the hex bits in. JMHO.
