This is the 6mm version. Not sure how they will break 300lbs. Revane, please do not list them in the "Towing" section. I've never used this for towing, but maybe 3/4". These things are a lot smaller than I expected. The pack dimensions are pretty accurate. I never got an answer to my A, B, C, D sizing question Received. probably because it will be different for each clamp size. 6mm (1/4 inch) is usually available in sizes 7mm for A, 6mm for B, 13mm for C and 25mm for D. They are today arrived and I will send them back for a refund.
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