Simple aluminum alloy stem. #6061-T6 Aluminum Alloy Forged Column Clamp Diameter: Φ28.6 mm Stack Height: 42 mm Weight: 130 g (60 mm), 135 g (80 mm), 140 g (3.9 inches (100 mm)); Product color and size may differ from the actual product depending on your display. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce. Please be aware of