Don't forget WLL on shackles is around 4-5 to 1. That is, a 4.5 tonne shackle has a tensile breaking strength of somewhere in the range of 16-20 tonnes of force. The reason I bring this up is someone asked me last week whats the point of having a 12000kg strap, when I only had a 4500 shackle. IMHO only, nothing less than a 3750kg shackle should be used for recovery like winching, and nothing less than a 4500kg shackle for high load recovery like snatching. Smaller shackles can be used for load bearing however - that is, using them for holding the vehicle in place whilst setting up other recovery equipment. I did this first hand when I rolled my old GQ trayback and had to drag it a bit at a time up a 70 degree plus hill and then hold it in place whilst re-positioning the recovery gear - took me and the old man about 14 hours to get it out!!!