Tool@rrest Global - Metric / Imperial Socket Set MetricFeatures Traditional ball release sockets present a serious risk when working at height. Sockets can be accidentally disengaged during every day working conditions, even if the ratchet is tethered securely. Tool@rrest pinned socket sets replace the exposed handle release with a recessed side release pin on the socket itself. Works to eliminate accidental release during ratchet operation. The pinned release mechanism means the socket will not disengage