1. You can adjust the jig on the way even without any other tools
2. Quick release lock design, easy to install and use
3. 28.6mm seatpost clamp for 25.4mm seatpost
4. 31.8mm seatpost clamp for 27.2mm - 28.6mm seatpost
5. 34.9mm seatpost clamp is suitable for 30.4mm-31.6mm seatpost
6. Material: aluminum alloy