This Offset Adapter allows you to run our Height Adjustable Riser with stock bars that have rise in them. This offset lets you clamp on the original clamping area of your stock bar. With out this part you would be trying to clamp on the curved area of the bar as it begins to rise. If you are replacing an OEM pivoting block riser you should not need this part. If your stock bar has rise in it and you are clamping our adaptor tube into the original clamps and then looking to run our Height Adjustable Riser on the outside of your original clamps, you will need this part to bring the clamping area back over to the original clamping area of the bar. Finally, this part will ONLY work with SP or SE risers, use with SP's make the most sense. They will NOT work on SS risers.