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These are top quality bolt and nut grabbing/holding pliers from Knipex. Best ones I have ever used, but are not cheap. Jaws are smooth, so as not to mar the bolt head or nut flats. Don't worry about the smooth jaws slipping. Get them positioned properly, even on fairly rounded bolt heads, and you will either run out of strength or twist off the bolt, before it will slip.
Great set of pliers but very difficult to justify the purchase. I have yet after several months to find a situation where I need this specific set of pliers for anything, believe me I grab them all the time but always en up using another tool