Adapter for 5/16' threaded shanks. For supports with M10 x 1.25 right thread. Can be used to adapt mirrors with specific thread for HARLEY DAVIDSON on TRIUMPH, MOTO GUZZI, HONDA, YAMAHA, SUZUKI, KAWASAKI and all motorcycles with M10 x 1.25 right thread (Note always check the thread of the mirror of your motorbike). Sold individually.