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Material: Aluminum Alloy. Diameter:31.8mm and 34.9mm.Diameter refer to seat post tube diameter not the seat post.
Aluminum Quick Release Bike Seat Clamp.strong sleek retaining bolts
strong sleek retaining bolts ensure it to be double sturdy and firm.
The "31.8", "34.9" refer to the seat post tube outer diameter not the seat post diameter!
31.8mm Bike Seat post clamp used for out diameter 30.2mm to 32.1mm bicycle frame seat Tube.
The "31.8", "34.9" refer to the seat post tube outer diameter not the seat post diameter!