Paul Components Shimano Thumbie Adapter

This adapter converts any Shimano bar-end shifter into a thumb shifter.  It also works with most Shimano downtube shifters. Hinged clamp allows for easy installation. (The bars, brake levers, and shifter shown are not included - they are pictured here just for example).  This component is slightly used, and has some wear marks. However, the wear is not visible when a thumbie is installed. 

Specs:

Clamp Diameter: 26 mm

Material: Anodized Aluminum

Designed, forged, machined, and anodized in the the USA.