Weight: Approximately 42g (actual measurement, with individual variations) Materials: Nylon, Stainless Steel (bolt) Applicable Mounting Diameter: 31.8mm, 25.4mm Mount Base: For Wahoo Included: Hex wrench This is a handlebar-mounted cycling computer mount. Two nylon rings are included for handlebar diameters of 31.8mm and 25.4mm. The outer box is not included to keep the package within the shipping size limits. Please be aware of this before purchasing. It will be shipped via anonymous delivery.