The hole diameter is 5.2mm, the hole distance is 28mm, and the outer size of the protective cover is 16x40mm. Applicable to 40x16 aluminum profiles, compatible with aluminum profiles with I-slot 8, widely used in various mechanical engineering and DIY projects. Protective function: effectively prevent dust and impurities from entering the interior of the profile, while protecting the aluminum profile from damage. Beautiful design: The black appearance provides a professional and elegant appearance to the project, making the construction more neat and beautiful. Uses: It can be used for mechanical engineering furniture construction, etc., for the closure and protection of aluminum profiles in mechanical structures to ensure neatness and safety. It can be used as an end cap for furniture components to enhance the appearance and prevent sharp edges., Manufacturer: SG Store