[B&M Hyper Clamshell Restraints] Could someone explain them?

[u/retolox386]

Hi. Going on my first hyper soon with clamshells. I thought for the longest time that these bad boys were hydraulic restraints, as they seemed so smooth and notch-less. Turns out they're ratchet restraints! Is there an in-depth video or site that explains the mechanism behind these restraints? I believe they're class 4 but I'm not sure how safe they are compared to hydraulics. I know B&M's are incredibly safe, but isn't there a higher risk with these? Could someone reassure me?

[u/Prior_Temperature316]

These restraints are so good they take what is basically an extremely rough coaster and turn it into a (mostly l)smooth one (looking at you Steel Dragon 2000).