Caution: do not allow for heavy milling and cutting, when you need it just use steel electrode holder
Small Quantity & OEM available for steel electrode holder
Stainless Centering Plate and Upper Aluminum Electrode Holder
Size as below:
15.4mm =4H54RU15
20.4mm=4H54RU20
25.8mm=4H54RU25
30.4mm=4H54RU30
32.5mm=4H54RU32
see drawing as attached.