I ordered these after spending many minutes sorting through a stack of clips at Harbor Freight. I was looking for parallel clamping surfaces. It seems fundamental that the bolt should be parallel to the clamp frame and the underside of the clamping surface perpendicular to the axis of the bolt to create a linear clamping force. Difficult to find in Harbor Freight, but possible. I figured buying a trusted brand would result in the perfect clamp. Not so. Look at the pictures how bad they are and they cost twice as much as the port cargo clips!