Built for hairline cracks and thin seams * Can also be turned 90 degrees for a broad flare * Copper/iron mix in heads provides bite in thin placements. Micro stoppers neatly attached to an OvalWire biner * Patented swage is stronger, more flexible and less prone to fraying * CE certified. Sizes 1 & 2 are for direct aid only (all others for use as passive protection)