0-605-21 Durite Battery isolator with removable key, Battery isolator with removable key in the Off position, Rated 75A at 24V (200A for 5 seconds), Suitable for 12V systems, M10 Studs, 22.5mm Fixing hole, Supplied with 2 keys, Spare or replacement key part number: 0-605-19, Sold in single packs.