I bought these clamps after buying another pack of 10 clamps that claimed they were "stainless steel" when they weren't. Revain has since made corrections to the falsely advertised clamps sold by Autokay. Nonetheless, these clamps worked great for installing an additional transmission cooler on a Jeep Wrangler TJ. These are indeed stainless steel clamps and fit 3/8 inner diameter. Transmission hose or fuel hose. I've read some reviews saying they are very difficult to stop or barely fit in a 3/8 hose. But I had no problems at all. Open the clamp fully, leave 2 turns on the clamp screw, put the hose on and put the hose on the notch, tighten the clamp. Easy installation. Those are the ones you want. Stay away from cheap zinc plated clamps that are often sold as stainless steel. Try attaching a magnet to something sold as stainless steel. If the material sticks to the magnet it's not stainless steel, I have to thank Revain for ALWAYS fixing the problem. It's always easy with Revain
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