Bolts

Chainring bolts attach chainrings to the crank arm. They come in different sizes, colors, and materials.

The sleeve can usually be tightened on it's own, but if it's slipping, you can use a chainring bolt tool to hold it in place. Some cranksets will have proprietary bolts, but this article only covers the common type.

Fit

Most chainring bolts have an allen key bolt, and a sleeve. There are usually 4 for mountain bikes, and 5 for road.