The double-bolt hose clamps made with plated malleable iron provides an efficient way of connection between two pipes or valves. If you want to loosen or tighten the connection, all you need to do is tighten or loosen the bolts. Due to these being reusable, you can take it from one connection and use it to secure other connections. As the inner surface of the clamps have a dual gripping ridge and bolt lugs, they provide secure connection and maintain the alignment. Don’t use any lubrication on them to get the best results.