Hey cyclists, let's talk safety for a minute! These JianLing bicycle wheel hub safety washers are one of those simple upgrades that can prevent some serious headaches. You get 8 pieces total - 4 of the M8 size and 4 of the M10 size, so you're covered for most bike types. Made from high-quality steel that's been heat-treated for maximum durability, these washers aren't going to break or deform even under tough riding conditions. They work by securely locking your bike wheels in place, preventing that scary moment when a wheel could potentially come loose. The black finish looks clean and won't stand out awkwardly on your bike. Installation is straightforward - they fit right onto your axle threads and provide that extra security layer you didn't know you needed. Whether you're rocking a mountain bike, road bike, folding bike, or even a kids' bike, these washers add peace of mind for all types of riding. They're designed for both front and rear wheel applications, and the hook design ensures they stay put. For the price, having this extra safety measure is totally worth it - because let's be real, nobody wants to deal with a wheel coming off mid-ride. Keep a few extras in your toolkit for bike maintenance days or to help out fellow riders. Simple, effective, and could literally save your ride!