Three phase Bridge Rectifier; perfect for use on single phase also. Can rectify voltage is up to 1600 V at a current of 63 A continuous. Comes with screws for terminals. Very high rating and very low voltage drop means these can easily pass many kilowatts without overheating. He sinks are still advised but mounting points are used to attach to a chassis. Can be useful for alternators or rectify full wave mains voltage to DC. Purchased as a pack of 10 so I have plenty of spare. Happy to combine postage up to a maximum of £5