This is SPM (Super Precision Machine Cut) Titanium kingpin.
Reve D have commercialized a kingpin for bell cranks using lightweight/highly rigid titanium material and high-precision cutting. Can be attached to the aluminum bell crank set for D1-202A RDX, or used as a replacement part for RDX genuine bell crank, graphite resin bell crank for D1-202 RDX, and RD-014BC/SR SG bell crank set.