Genuine Yamaha M10 x 1.25 pitch rear brake caliper clamp bolts used for bolting the two halves of the caliper together. These bolts do not have a part number because they are part of the complete caliper assembly and are therefore not available from Yamaha. 47mm long under the head with a 30mm shoulder and 17mm thread. The head has a 14mm washer based hexagon and the washer base is 17mm in diameter. These are exactly the right size for this application, where sometimes pattern parts may not be correct. These are OEM removed from an original Yamaha XJ900S Diversion motorcycle. Also fit Vmax rear calipers and probably many other Yamahas from the 1980s and 1990s, but with no part number it is difficult to specify which is why I have given precise dimensions for these bolts. No rust, excellent threads and in good condition. Price is for two. Please note that free UK postage and the reasonable cost that I charge for international postage does not include tracking.