Made out of Ductile Iron, which expands less than steel, with the same strength as 1045 steel. Machinablility is better than 1045 steel. Easier to achieve higher tolerances, and better surface finishes. Taller eliminating the need for girdle spacers. This makes a more ridget and stable combination. Can be used with 14mm studs.
Includes a wider Maincap so a Thrust bearing can be used on the bottom side.