It’s plastic Rod. The bolt wasn’t cross threaded and no thread lock was used as the bolts were tight coming out the first time. I think the factory must have used a full bottle on each bolt and some must have still been in the bolt holes. I ended up heating the final bolt with a soldering iron and after about 5 minutes heating it eventually moved using mole grips then unscrewed. I have put acf50 on new bolts and they screw in and out easily so I really don’t know how they seem to seize once they are nipped up. They make a big ‘crack’ as they loosen off. I have some stainless bolts but they were what I used the last time so I need some that won’t round off easily. At least they are out now without any damage to the bike just a couple of bits of anodising rubbed off inside the recessed holes of the cnc part. Thanks for the soldering iron and rubber band tips.