Seat tube gauge

Material : Aluminum
Size: Ø34.9/31.8/31.6/31.4/30.9/30.8/30.4/30.2/30/29.4/29.2/28.8/28.6/28.2/27.4/27.2/27/26.8/26.4/26.2/26/25.8/25.6/25.4/25mm