The SK-5001 is a 50 ohm, 8.5 GHz, 3.5mm-type standard kit (general purpose calibration kit) that includes male and female 3.5mm-type open, short, load and two 3.5mm-type through adapters for a total of 8 complete components.
In addition, it includes an open end wrench and a torque wrench.
The SK-5001's outstanding electrical specifications make it suitable for use in the calibration of most network analyzers (e.g. HP 87xx, Agilent E5061A/B, E5062A, E5071C...etc).