Tool Basics

Socket sizes, deep and shallow sockets, breaker bars, swivels and steel types, explained in plain words.

  • Amazon Basics 201-piece mechanic's socket set
    Tool Basics

    Chrome Vanadium vs Chrome Molybdenum Sockets

    Chrome vanadium vs chrome molybdenum sockets: learn how the steels differ, which socket suits hand or impact tools, and what to check before choosing.

  • Amazon Basics 201-piece mechanic's socket set
    Tool Basics

    How Are Socket Sizes Measured?

    Learn how socket sizes are measured in SAE and metric units, how to match a socket to a fastener, and how drive size differs from socket size.

  • 20-piece 3/8 inch drive universal impact socket set
    Tool Basics

    What Is a Universal Joint Socket?

    Learn what a universal joint socket does, how its swivel head reaches angled fasteners, when to use one, and how it differs from a universal joint adapter.