I love these clips, the holding power is amazing! Stronger than the clips I bought at Home Depot. I mainly use them to shade fabric in my outdoor vegetable garden. The blackout fabric is stretched horizontally over the cables at certain intervals, these clamps press the fabric against the cables. Even in very strong winds of at least 25mph, I estimate the fabric will not move. I use the larger size as the main handles and then the smaller ones through the mid-length sections of the fabric.