SHIMANO BR-RS505 CALIPER FIXING BOLTThe Shimano BR-RS505 Caliper Fixing Bolt is designed for flat-mount disc brake calipers. It attaches the rear mounting plate to the frame with 15mm thick chainstays. The required bolt is determined by the chainstay thickness, so make sure you choose the right bolt for your bike.FeaturesFor 15mm thick chainstaysManufacturer Part Number: Y8N208050 | Shimano BR-RS505 Caliper Fixing Bolt Single, Y8N208050