Weight: Approximately 51g (certified) / 47g (actual, with individual variations) Materials: Silicone, iron Dimensions: Nut depth approximately 8.2mm, 63mm pitch Other: M5-10 steel fixing screws, cable ties included This is a mount base for bottle cages. It can be installed without modifying the bicycle frame. It allows for the installation of a tool bottle under the down tube, etc., without frame modification. * If the fixing target is thinner than 2mm, the fixing bolts will contact the frame. Adjustment with spacers (washers, etc.), replacement with shorter fixing screws, or frame protection with vinyl tape may be necessary. If you would like multiple units or a set with a tool bottle, please consult before purchasing. If you are purchasing with other bicycle accessories, we will discount the shipping cost for items that can be shipped together. Shipped via anonymous delivery.