These are 20mm couplers.\r\nWith these you will get a long lasting product which is guaranteed to fulfill your needs.\r\nThis product is part of our extensive conduit range of products.\r\nIt will allow you to connect two pieces of conduit together to insure a safe and stable connection.\r\nConduit is used to neatly pack away wires, this allows for all trailing wires to be easily managed.\r\nHowever if this is not what you are looking for we have a wide range of conduit products on our website.\r\nThis 20mm B/E couplers come with a one year guarantee, as do all of our products on this website online at Electricals247.co.uk.