I have been using GroundGrabbas for 9 months now, and haven't looked back. Have used them in standard earth, rock-hard ground, sandy soil etc., and have never failed to get a secure anchorage. I used GroundGrabba Pro II screws at the Big Red Bash last year, in soft sandy soil at the edge of the Simpson Desert. Excellent! Everyone else was struggling to peg down their awnings, but my GroundGrabba Pro IIs were rock solid. I laugh to myself when I think back to the back-breaking days of hammering in standard ground pegs, that had no grip, often came loose, and often couldn’t even be hammered into tough earth!