Lovely set of crank arms but they do have a bit of an issue. I personally bought these brand new and used them for a couple of months at best when I decided to change frames. Using the self extracting crank bolts they came with was a mistake. The drive side extracting washer sheared off and stripped the threads out for extracting. Half the washer is still in there.
I tried the other side and felt the same thing happening so removed it with a conventional crank extractor although some damage had already been done as visible from the aluminium stuck in the threads of the original self extracting washer.
The drive side was removed with brute force and a bearing puller which explains the gauges on the back side around the spider.
So long story short. Original self extractor bolts bad. Damaged threads.
They can be refitted and used because the pedal threads and tapers are fine but getting them off again will be a pain.