Don't forget: versatile band clamps create a leak-free connection that's great for repairs or custom builds. The purpose behind Hooker's newest band clamp is to provide ease of use while creating a tight seal. Designed for slip-fit exhausts, the clamps clench down on the outside tubing to create a solid leak-free connection. They are made from high-grade stainless steel with a 2.5" or 3" diameter.