Review on Fstop Labs Heavy-Duty Screw Style Tent Stakes - Large 10-Inch Ultimate Ground Anchor Pegs for Outdoor Use by Scott Tompkins

These are not good. They aren't stiff enough to move effectively over rocky ground. I pre-drilled the hole with a long drill bit designed for this purpose. When driving, the elastic deformation of the plastic means that 1/2 to 3/4 of the rotation is lost, which is why they romp on the spot. I broke one of them under load in a light wind. The product is deeply disappointing. The attachment points at the end were good but otherwise a complete failure as a stake.