This skyhook is designed to pass to ATO through dug holes in the rock with a diameter of 6 mm, a depth of 10 mm or more. The preparation time for a 6mm hole is twice as fast as a 8mm hole, but be aware that the 6mm tool is more fragile, so you need to have a spare. Works great even on overhanging areas. This skyhook doesn't spoil the openings as traditional skyhooks do when each successive pass becomes problematic and dangerous.
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