Stainless Steel Hose Clamps 8mm-16mm x 9mm W4 (10 Pack) - Heavy Duty Automotive, Plumbing & Marine Applications

There are a couple of advantages to these Norma clamps but the main being that they do not dig into the material being clamped because the serrations are on the outside of the clamps. I have used both types and prefer Norma clamps where it is critical to get a tight clamping action to prevent leaks or damage to the part being clamped.