Hooker's Alignment Weld Sleeves allow the fabricator to align, hold and weld two pieces of mild steel tube without help. Because no rod is needed, the welder has a free hand. The Alignment Sleeves assure a perfectly aligned joint with no weld slag inside to reduce the tube diameter and restrict air flow. Perfect alignment and just the right amount of welding material results in a very professional looking weld. Weld Sleeves are packaged 20 sleeves per bag.