Professional bar adapters from Cannon. TThese handy adapters allow the operator to use the same bar on many different saw makes. The CBW-20040 adaptor plate (S1 to C1) is a Stihl 12.1mm bar mount to Echo 8mm bar mount. It fits Echo saws with bar studs 32mm - 36mm center to center. Please check your saw before ordering. Important Note: Not all bar mounts are manufactured the same. Some bars may require adjuster holes to be slightly enlarged for bar adjuster tab to fit.