Trek Nutsert Plug M4x13 mm W308963 bottle cage insert and eyelet

The Trek Nutsert Plug M4x13 mm W308963 bottle cage and eyelet insert is a component used to attach a bottle cage or other travel accessories to bicycle frames, particularly those that require mounting with threaded eyelets. It is used to add inserts so that screws can be inserted into materials such as aluminium, carbon or other light alloys. Technical specifications- Reference: W308963 - Dimensions: M4x13 mm (M4 screw diameter, 13 mm length) - Material: Stainless steel (corrosion resistant and durable)- Used to attach a bottle cage or other accessories to bicycles, especially for frames that do not have pre-existing mounting eyelets. - Compatibility: Designed for bicycle frames that require the installation of bottle cages or additional accessories.