Velo Orange stainless steel handlebar shim
Velo Orange stainless handlebar shim
These shims allow 25.4mm diameter handlebars to fit in 26.0mm stems. They are precision made from stainless steel and then bead blasted to prevent slipping.
The shims are available in two widths: the 35mm width fits most aluminum quill stems while the 45mm width is for most threadless and wider quill stems.