- CNC-machined 6061-T6 aluminum with rounded tooth profile to reduce chain wear

- Includes: (5) 8.5mm outer bolts, (5) 6mm outer bolts, (5) 5mm inner nuts

Made in the US from 6061-T6 aluminum alloy, Box Two Chainrings are round and true. They fit 104 BCD four-bolt cranks and are available in black anodized with laser-etched graphics from 38 to 45-teeth.