GRI MMR-25 Rare Earth Magnet, 1/4" 1/8"

Keep modern vinyl and thin-frame windows secure without drilling or damaging frames. The George Risk Industries MMR-25 Mighty Mag magnetic contact magnet is designed for installers who need a low-profile, reliable solution for security, alarm and surveillance monitoring. At less than 1/8" high and with a 0.25" diameter rare earth magnet, the MMR-25 mounts quickly as a surface-mount accessory and pairs seamlessly with GRI press-to-fit contacts. Nickel-plated for corrosion resistance, this compact magnet delivers consistent actuation and long-term durability in residential and commercial window sensor applications. Installers and integrators benefit from faster installs, fewer callbacks and improved compatibility—use with the MM-600 and a standard gap switch to achieve wider gap tolerances when required. Ideal for perimeter security, access control and retrofit surveillance projects, the MMR-25 helps maintain aesthetic integrity while ensuring reliable monitoring. Order the GRI MMR-25 to simplify installs and strengthen your window sensor deployments.

• Ultra-low profile rare earth magnet protects vinyl and thin-frame windows by eliminating the need to drill
• Fast, surface-mount installation reduces labor time for installers and integrators
• Powerful 0.25" diameter rare earth magnet provides reliable contact for security and alarm monitoring systems
• Nickel-plated finish resists chipping and corrosion for long-term field reliability
• Compatible with GRI press-to-fit contacts and MM-600 for wide gap applications, increasing installation flexibility