BikeMaster Handlebar Mirror Adapter Clamps - T3 (10mm) (Black) At BikeMaster, they understand the quality and performance that motorcycle owners demand. They also understand that quality should be affordable. Not just for professional riders and mechanics, but for the everyday rider / mechanic as well. That is why BikeMaster continues to bring that level of quality and performance to all riders with their complete line of tools, parts and accessories at affordable prices.These adapters allow you to fit mirrors to a bike without ugly sheet metal brackets fitments.Cast from lightweight aluminum and available in chrome, silver or black.T3 model fits 7/8" diameter bars and is available in 8 mm and 10 mm.