Pack of 40 M10 M12 M16 M20 M25 threads - for insertion into 25mm holes M10 M12 M16 M20 M25 cable gland seals are suitable for cables from 3 to 15mm diameter Weather resistant electrical cable glands, each gland with nylon lock nut, rubber washer and rubber seal in the dome Designed to prevent the ingress of water, dust etc. at the cable entry point in junction boxes, connection boxes, switchboards etc. This creates a dust and watertight seal around the cable. Safe DIY tools suitable for quick connection to home, garden or outdoor lighting. For junction boxes, panels, enclosures, outdoor sockets etc.