If you are looking to raise the handlebars of your custom bike without changing its design or grip position, you can use CustomAcces risers. These parts are designed for 1-inch thick handlebars, which is 25 millimetres, but with different measurements according to the rider's preference.
The CustomAcces risers have a triple layer of chrome to prevent oxidation and corrosion over time and are available in stainless steel or black. The packaging comes with two high-precision screws that will help you install the risers easily and securely.