A generic R100-series receptacle for the 100 mil (2.54 mm) grid with a wire-wrap termination. It is pressed into the fixture's probe plate once and the spring probe seats in it, so a worn probe can be replaced without unsoldering or rewiring the fixture.
It is the longest body variant in the generic R100 wire-wrap range, so it is the one to reach for where the receptacle has to bridge a deeper plate stack or present a longer wrap post below the plate. The R100 pattern matches the standard 1.7 mm drill used by branded 100 mil bodies; confirm the overall length against your stack-up, since that is what separates the R100 length variants.
Generic R100 series, for 100 mil (2.54 mm) test-point pitch
