The seat post collar should match the diameter of the seat tube of your frame, not the diameter of the seat post itself. The M5 bolt is equipped with a spherical washer and attaches to a cylindrical anchor sleeve. This means that the threads are always perfectly aligned, avoiding seizure and ensuring a constant clamping force. Lightweight 6061 T6 aluminum, M5 stainless steel bolt with integrated washer. Tool Interface: 4mm Hex Wrench CNC machined in Minneapolis, MN.
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