To fix your broken chain, simply join the broken chain ends by snapping the quick link together in the intended direction (there's an arrow direction indicator) and applying a bit of pressure from a turn of the cranks. Voila! You're now ready to get back in the saddle on the road or trail. Please note, Shimano doesn't recommend reusing their Quick Links. Each package contains two quick links (that's four separate halves), so you can keep a spare handy after you've made a road or trailside repair to your chain.