Replace rusted or missing screws/bolts with Stainless Steel Great looking socket button head machine screws Exact metric thread size for all bikes Enough fasteners for two bikes Replace those old, rusted bolts with our grade 18-8 stainless fasteners and add a touch of class to your bike. These bolts are 6mm in diameter (M6) which is the correct size for virtually all bike posts or studs. The length is 20mm (approx. 3/4”+) which will provide excellent retention of your brakes. The heads are the “Socket Button Head” which are very attractive fasteners that can be installed without any special tools. These bolts will outlast your bike The mounting system for both V-Brakes and Cantilever brakes are the same. If you decide to switch from one style to the other, you will not have to change post fastener bolts If your bike came from the factory with plated steel screws it is only a matter of time until they will rust. Replace them now before they seize in your posts One payment of $6.00 buys eight stainless bolts (machine screws) & washers.