121955 -

This specific tool is widely available from automotive and tool retailers:

Tools like the 121955 are "deep" or "long" (100mm) to reach recessed bolts. 121955

Ideal for heavy-duty automotive applications where a standard-length bit cannot reach the fastener. This specific tool is widely available from automotive

1/2" drive, Torx T55 profile, 100mm total length. Torx T55 profile

The phrase "" does not appear to be a standard technical name for this tool. However, in the context of hardware and construction, it often describes: