Front Basket that can be front light attaches to the adapter. Stainless Steel Mount Diameter: Φ 25.4 mm mounting Length: 42 mm Weight: GSM mounting parts included the item color, about Size Item Color May Vary Depending on the type of display, actual product may vary slightly from the product image. This listing for the specification, improved the design of the logo, etc., may be altered. In addition, the manufacturers to reveal the answer your questions about the dimension and a personalized fit and you are not the actual product. Thanks for your understanding.