I just added a transmission cooler and power steering cooler to my jeep. I did this particular upgrade on three jeeps. I used Gates 3/8 inch transmission hose rated at 400psi. These 3/8 inch stainless steel clamps work well although they are tight. So they definitely won't fit a larger hose, but are perfect for 11/32" or 3/8". The clamps look neat and clean and provide a great, even seal. Unlike cheap worm drive clamps, there is no extra protruding clamp to look like crap or irritate your knuckles. I'm a sucker for using worm drive clamps because these beauties are worth every penny. No, I don't work for a company, but I'm very happy with this solid machine.