Pack of 40 M10 M12 M16 M20 M25 threaded - to be inserted into 25mm holes The M10 M12 M16 M20 M25 cable gland seals are suitable for cables from 3 to 15 mm in diameter< /p> Weatherproof electrical cable glands, each cable gland with nylon lock nut, rubber washer and rubber gasket inside the dome Designed to prevent penetration water, dust, etc. at the point of cable entry into junction boxes, junction boxes, panels, etc. This creates a dust and water tight seal around the cable. Safe DIY tools, suitable for quick connection to home, garden or outdoor lighting. For junction boxes, panels, enclosures, outdoor outlets, etc.