Wolf Tooth Seatpost Clamp 36.4mm Blue Machined Aluminum M6 Bolt 4mm Hex Key. 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. M6 stainless steel bolt with integrated washer Tool interface - 4mm hex key ITEM SPECIFICATIONS COLOR: BLUE DIAMETER: 36.4mm DEFINED COLOR: BLUE MATERIAL: ALUMINUM TYPE: BOLT-ON