Wolf Tooth Seatpost Clamp – 28.6mm Blue. The precision-engineered Wolf Tooth Seatpost Clamp secures your seatpost and looks good doing it. At the heart of the Wolf Tooth Seatpost Clamp is a custom self-aligning bolt and anchor. The M5 bolt includes spherical washer and mates with a cylindrical anchor barrel. This means that threads are always perfectly aligned preventing binding and ensuring consistent clamping force.