Steel block counterpart 40 x 20 x 3 mm is a ferromagnetic component designed for use with permanent magnets and magnetic fastening systems, with nickel surface protection. The product is not a magnet; it acts as a contact element and helps guide the magnetic flux, which can improve attraction when installed correctly opposite a magnet. The rectangular shape and fixing hole make it suitable for installation in machinery, fastening devices, magnetic closures, workshop applications and various technical structures where a stable and durable contact surface is required.