These are for mounting oversize (1-1/8") on my CR250R, they are rubber mounted just like the oem bits I was replacing.
I bought these oversize plus 10mm rise for my EVO Fat Bars. I wanted to raise the fork tubes to lower the front of the bike, plus I wanted new bars. The 10 mm rise enabled me to raise the fork tubes 7/8" in the triple trees. I used the Devol lowering link for the rear. I would have gave these clamps 5 stars but one of the clamps top caps had some nasty machine marks on top which doesn't effect the performance, just appearance. The price was right at MotoSport.