Fluke ES-162P4 Stake Set. A604510301, for 4 pole measurement. Mfg part Fluke 2577103. Fluke parts and accessories. Needed to perform 3- and 4-Pole Fall of Potential testing (Stake testing) Used with both the Fluke 1623 and Fluke 1625. Already included in the Fluke 1625 Kit.