This shaft allows an RDE tip (E3 or E4 Series only) to be used as a non-rotating, stationary working electrode. The upper end of this shaft has a banana jack which can accept a standard banana cable, or alternately, a banana stud (included) can be installed in the banana jack, and this stud can accept an alligator clip. The overall length of the shaft (including the banana stud) is 170 mm. The diameter of the shaft is approximately 7 millimeters. NOTE: Part number AFE3F is only a shaft. Actual E3 & E4 Series RDE tips and banana cables are sold separately. NOTE: If you own an E5 Series RDE tip, then use part number AFE5F instead .