Alright gearheads, listen up! If you're working on your Yamaha and need replacement brake disc bolts, this Caltric set has you covered. These aren't your average bolts - they're specifically designed for rear brake discs on a ton of Yamaha models including the Raptor 660R (2001-2005), Banshee 350, Warrior 350, and many others. The specs are spot-on: M8-1.25 thread size, 21mm length with 16mm head diameter. They fit exactly like the original equipment part numbers 90109-08789-00 and 90111-08053-00. Whether you're doing routine maintenance or rebuilding after a rough ride, these hex socket button bolts provide secure mounting for your brake disc. Super important - always compare the pictures to your existing hardware to make sure you're getting the right fit. Comes as a set of 4 bolts, which is typically what you need for a single rear brake disc installation. Perfect for DIY mechanics who want reliable parts without breaking the bank.