Sockets fit around the head of a fastener and are less likely to slip off when loosening or tightening it compared to open-end wrenches. Hand sockets use hand power to rotate fasteners, while impact sockets use an impact power wrench for greater turning force. Socket adapters and accessories allow compatibility with drive tools, extensions, and sockets having different drive sizes. Extensions can extend the reach of standard sockets and impact sockets to access fasteners in tight spaces. Hand socket bits and sets are tools that fit inside the indentation on the fastener head to turn it, while impact socket bits use an impact power wrench for high turning force.