I bought a pack of 10 size 6 for a 5/16 fuel line between the fuel tank and the hard line on my '86 Magna. It's a very short run and there isn't much room. Ten packs under $5 seemed too good to be true and I figured most of them wouldn't pass quality control. To my surprise all 10 were of high quality, very durable and well made. No rough or sharp edges and the screw mechanisms worked perfectly. As you can see from the photo, the diameter of the strap can be very small and the mechanism keeps it secure. I put this clip on twice and took it off to trim some of the excess tape. It kept its shape and the screw mechanism didn't get sloppy with repeated actions. I use the rest to replace old and weaker spring clips when needed. Trust the size chart - it's accurate. I would buy them again.