Box Two Chain Tensioners let you dial in your chain tension, so it's just right. Two mounting holes provide room for ample adjustment on most frames. When used correctly, Box Two Chain Tensioners help protect frame dropouts and keep your rear wheels locked in place where they should be.

Features:
- New and Improved
- 30mm of Adjustment
- Dual Axle Position
- Anti-Rust Hardware
- Anodized Finish

Specs:
- Axle Size 10mm (3/8") only
- Material 6061-T6 Aluminum
- Hardware
- Stainless Steel